A woman walks past a choir of toilets that sing to thank visitors for putting in the effort of trying to learn more about what is normally a taboo topic of sitting on them, at an exhibition titled "Toilet !? Human Waste and Earth's Future" at the Miraikan National Museum of Emerging Science and Innovation in Tokyo on July 3.

The exhibition, which opened at the museum on Wednesday, explores the world of toilets, with the main exhibit centring around a massive toilet into which visitors are allowed to slide to simulate the journey of human waste matter into the sewers. The exhibit also includes five zones that range from showing exactly what one's excrement is made of to how different types of toilets are used around the world, and even a possible space toilet that could be used to grow plants. The exhibit is open until October 5 and costs $11.80 to visit. Reuters/Issei Kato