A few years ago, the British chocolate manufacturer Cadbury’s received a large number of customer complaints, claiming that they had changed the taste of their Dairy Milk brand. They were at first baffled, because the formulation hadn’t been altered for years. However, what they had done was change the shapes of the blocks you would break off a bar, rounding their corners. And smoother shapes taste sweeter. Truly. Nothing about perception is completely objective, even though we act as though it is. When we complain that a room is hot, there may be no point at which we agree about what ‘hot’
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