A new exhibition at the National Technical Museum in Prague marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression the nation underwent and at how it resisted.

It focuses on the technology used by the totalitarian regime to control its citizens — and the innovative means they used to undermine the omnipresent control.

More Images
In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

A new exhibition at the National Technical Museum in Prague marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression the nation underwent and at how it resisted.

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

The secret police known as StB — with about 15,000 staffers and a network of up to 100,000 collaborators — could simultaneously spy on and bug 600 people.

This picture taken on Tuesday, Nov. 12, 2019, shows a view out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

This picture taken on Tuesday, Nov. 12, 2019, shows a view out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a young girl takes a photo at the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a young girl takes a photo at the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor walks up the stairs of a church tower downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor walks up the stairs of a church tower downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

There are typical James Bond-style spy gadgets, such as a microphone concealed in a watch or tiny cameras. But the most commonly-used surveillance equipment was much bulkier and had to be hidden in suitcases, pieces of luggage or even baby carriages.

In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

The secret police known as StB — with about 15,000 staffers and a network of up to 100,000 collaborators — could simultaneously spy on and bug 600 people.

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

This picture taken on Tuesday, Nov. 12, 2019, shows a view out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

This picture taken on Tuesday, Nov. 12, 2019, shows a view out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a young girl takes a photo at the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a young girl takes a photo at the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor views the exhibition "The Technology in Dictatorships," at the National technical Museum in Prague, Czech Republic. The exhibition, the first of that kind here, marks the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor looks out of a window of a church tower in downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor walks up the stairs of a church tower downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)

In this picture taken on Tuesday, Nov. 12, 2019, a visitor walks up the stairs of a church tower downtown Prague, Czech Republic. The tower was used for spying on people and western diplomats by the communist secret police. The Czech Republic is marking the 30th anniversary of the 1989 anti-communist Velvet Revolution by looking back at the surreal repression of a nation and resistance against it. (AP PhotoPetr David Josek)