The five Olympic rings are back in Tokyo Bay.

They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic.

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The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. (AP PhotoEugene Hoshiko)

The five Olympic rings are back in Tokyo Bay.

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. (AP PhotoEugene Hoshiko)

The rings — painted blue, black, red, green, and yellow — are gigantic. They stand about 15 meters tall and 33 meters in length — about 50 feet tall and 100 feet in length.

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. (AP PhotoEugene Hoshiko)

The reappearance of the rings is the latest sign that organizers and the International Olympic Committee are increasingly confident that 15,400 Olympic and Paralympic athletes can safely enter Japan during the pandemic.

A police officer patrols near the Olympic Symbol being transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

Organizers have been vague about exactly how the Olympics will be held. Plans are in flux with dozens of COVID-19 countermeasures being floated involving athletes, fans, and tens of thousands of officials, judges, VIPs, and media and broadcasters.

A woman watches at the Olympic Symbol being transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

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The Olympic Symbol is transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

The Olympic Symbol is transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

The rings arrived on Tuesday after a short cruise from nearby Yokohama and are positioned on a barge in the shadow on Tokyo's Rainbow Bridge.

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. (AP PhotoEugene Hoshiko)

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. (AP PhotoEugene Hoshiko)

The rings — painted blue, black, red, green, and yellow — are gigantic. They stand about 15 meters tall and 33 meters in length — about 50 feet tall and 100 feet in length.

The rings will be lighted at night and herald the coming of the Tokyo Olympics, which are to open on July 23, 2021, followed by the Paralympics on Aug. 24.

The rings made their first appearance early in 2020, just a few months before the Olympics were postponed late in March.

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. (AP PhotoEugene Hoshiko)

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. (AP PhotoEugene Hoshiko)

The reappearance of the rings is the latest sign that organizers and the International Olympic Committee are increasingly confident that 15,400 Olympic and Paralympic athletes can safely enter Japan during the pandemic.

These Olympics are sure to be like no other.

They will hinge partly on the availability of vaccines and rapid testing for COVID-19, and on athletes and other participants following strict rules that could involve quarantines, a limited number of fans in venues, and athletes leaving Japan shortly after they finish their competitions.

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. (AP PhotoEugene Hoshiko)

The Olympic Symbol is reinstalled after it was taken down for maintenance ahead of the postponed Tokyo 2020 Olympics in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. (AP PhotoEugene Hoshiko)

Organizers have been vague about exactly how the Olympics will be held. Plans are in flux with dozens of COVID-19 countermeasures being floated involving athletes, fans, and tens of thousands of officials, judges, VIPs, and media and broadcasters.

Protocols should become clearer early in 2021 when decisions must be made about permitting fans from abroad, which will affect revenue from ticket sales.

The meter continues to run on billions in costs, with Japanese taxpayers picking up most of the bills. Reports in Japan this week say the cost of the postponemen t is about $3 billion.

A police officer patrols near the Olympic Symbol being transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

A police officer patrols near the Olympic Symbol being transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

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A woman watches at the Olympic Symbol being transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

A woman watches at the Olympic Symbol being transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

The Olympic Symbol is transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)

The Olympic Symbol is transported on a barge in the Odaiba section Tuesday, Dec. 1, 2020, in Tokyo. The five Olympic rings are back in Tokyo Bay. They were removed for maintenance four months ago shortly after the Tokyo Olympics were postponed until next year because of the COVID-19 pandemic. (AP PhotoEugene Hoshiko)