What’s the best size for a home screen icon? Scott Herz, one of my Purple teammates, soon gave us the answer. He wrote an app and circulated it around the Purple team. There wasn’t much to it. The app launched showing a very large Start button. After tapping that button, the screen would go blank for a moment, then a box would appear somewhere on the display. The goal was to tap the box. After you tapped, whether you succeeded or failed, and after another momentary blank, another box would appear somewhere else. Only this next box would be a different size, maybe larger, maybe smaller. Tap the
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