French textile design and applied arts student Elisabeth Buecher designed My Shower is a Green Warrior (prototype), which fights water overconsumption by slowly inflating around you while you shower, leaving you only a few minutes to take your shower before trapping you. It uses innovative materials, printing techniques and inflatable technology to do so, but I think her experimental thinking is what's key to this design. I love that it awakens people to their behavior, allowing them to change it before the curtain inevitably traps them. It's probably too unpleasant for most, but I think it could work wonders in places like hostels or extreme dry climates, where long showers should be a luxury to begin with. Buecher also designed a shower curtain with spikes that inflate, slowly pushing you out of the shower; see it here.