This is indeed a shower curtain -- a 'pushy' shower curtain at that. The idea behind the pushy shower curtain is to actually raise awareness about water waste. The designer, Elisabeth Buecher wanted to create a shower curtain that would force users to waste less water.
The shower curtain inflates after four minutes of showering, leaving you with little to no room to get clean! The artist says, "If you don't want to get trapped you have to get out before it does and stop damaging the environment." Pretty smart idea if you ask me.