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I have seen fold up beds but never a fold up shower! This would be handy for those that live in tight spaces like a lot of New Yorkers and other compacted city life apartments. Apparently there is also a problem for space in France because it was a French company named Supiot that came up with this idea. They are not being shipped as of yet but it looks like a great idea and very helpful for some people.
Image Source: http://www.ohgizmo.com/2010/07/08/folding-shower-lets-everyone-in-the-house-have-their-own-shower/