People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )

People perform the belly button dance during the Hokkai Belly Button Festival in Furano City, Hokkaido Prefecture, northern Japan, on July 28, 2024. The Hokkai Heso Matsuri has been held since 1969, as Furano is located in the geographical center of Hokkaido, and is one of Hokkaido's most representative summer festivals. Participants paint faces on their bellies and dance while hiding their heads under large umbrellas.( The Yomiuri Shimbun via AP Images )