Public Semi-Transparent Toilet

It is impossible to see into the toilet, which is free to use, but the person inside can see passers-by. An artist has created this usable public toilet in a glass cube to challenge the curiosity -and bravery- of people passing London's Tate Britain gallery. Visitors have to "defy their own embarrassment" to use the minimalist cubicle, made from one-way mirrored glass.