Chapter 8

The Great Tradeoff

It is probably the world’s most underrated conundrum, faced by tens of millions of people every day. Make the right choice and a timely ablution waits; make the wrong choice and receive minor embarrassment, discomfort, and quite possibly a haranguing from a member of the opposite sex. Our near-universal competence in making the right choice is a testament to our ability to draw on our understanding of how the world works, taking in and processing an array of visual, audio, tactile, and olfactory cues, and to translate the stimuli into that all-important decision: choosing the proper door to enter for either the men’s or the ladies’ room.

Public restrooms may not immediately spring to mind when you think about designing ...

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