Otearai are public restrooms found mainly in parks and other outdoor public spaces in Japan, which have been used since the Edo period. They typically consist of two stalls with a sink between them and a single entrance with a sign above it indicating that it is an otearai. Using an otearai has many benefits such as providing basic sanitation services when there is no access to indoor bathrooms nearby, providing privacy, being cost effective, being easy to clean and being environmentally friendly. There are also certain etiquette guidelines that need to be followed when using an otearai such as washing hands before entering, disposing paper seat covers properly, not making too much noise inside and never taking anything from inside.