In his book What the Dog Saw (2009, ISBN: 0316075841), Malcolm Gladwell praises the pitchman Ron Popeil who designs products such as the Ronco Veg-O-Matic that are easy to use and, more importantly, to understand. He writes that if Popeil had introduced the VCR, it wouldn't be a black box with a blinking clock. Instead, the tape would be visible, "so that if it was recording you could see the spools turn."
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