A worker checks for cracks on a toilet at a Toto toilet factory in Kitakyushu, Japan February 6, 2020. Picture taken on February 6, 2020. On southwestern Japan's Miyajima island, a short walk from one of the country's most famous ancient temple sites, there's a brand new attraction for tourists - a state-of-the art public toilet block nearly as big as a tennis court. REUTERS/Sakura Murakamii

Toilets ready for shipment cover the floor of a Toto toilet factory in Kitakyushu, Japan February 6, 2020. Picture taken on February 6, 2020. The 183 square metre facility - created jointly by the local municipality and Toto, Japan's biggest toilet maker - is just one of hundreds that have been spruced up across the country ahead of this summer's Olympic Games in Tokyo, removing old-school squat toilets to welcome foreign tourists. REUTERS/Sakura Murakami

A worker sprays glaze onto a toilet at a Toto toilet factory in Kitakyushu, Japan February 6, 2020. Picture taken on February 6, 2020. The challenge is dwarfed by that faced by planners for Tokyo's previous Olympics. Before the 1964 games, only 20% of the city had a sewerage system, pit toilets festooned the city and trucks dubbed 'honey wagons' patrolled neighbourhoods to suck human waste into tanks for disposal elsewhere. REUTERS/Sakura Murakami

A toilet at the Ariake Arena, which will host volleyball and wheelchair basketball competitions in Tokyo 2020 Olympic Games, is pictured in Tokyo, Japan February 2, 2020. Picture taken February 2, 2020. But the refurbishment programme for 2020 plugs into a public concept of advanced cleanliness that has become embedded in the Japanese psyche since the 60s, Masakazu Toki, professor emeritus in cultural anthropology at Edogawa University says. REUTERS/Kim Kyung-Hoon

A display at the Toto Museum in Kitakyushu, Japan shows the inner workings of a toilet, February 6, 2020. Picture taken on February 6, 2020. "Japan wanted to become a 'leading country' in the eyes of its visitors by making the country pristinely clean," evident in a campaign to make the streets cleaner ahead of the 1964 Olympics said Toki. REUTERS/Sakura Murakami

Toilets across the ages are put on display at the Toto Museum in Kitakyushu, Japan February 6, 2020. Picture taken on February 6, 2020. With a government survey showing roughly 40% of Japan's public restrooms hosted squat stalls in 2016, the government started a campaign to help municipalities - particularly in popular destinations like Kyoto - fund conversion to sit-down toilets, anticipating Olympics tourists will explore Japan beyond Tokyo. REUTERS/Sakura Murakami