The items are the bike lock, the cell phone tower, the hospital gown, the toilet, the airport baggage carousel, and the prescription-medicine label. We think one of them is elegant but frivolous, one might work well but is unlikely to be adopted anytime soon, one’s confusing, one is genuinely ingenious (if it really works), one is “why didn’t anyone think of this before?”, and one should be put into production immediately. See if you agree.