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Clark's Tech Blog[^]:

When you are an experienced computer user and use a mouse you don’t notice the mouse. Rather you just think about moving the cursor on the screen. The mouse withdraws. However if your cable comes lose you suddenly see the mouse as the mouse. It’s operational failure lets you encounter it anew. Good design shouldn’t call attention to itself but should withdraw the way a mouse does. It becomes an extension of yourself. If it isn’t withdrawing then probably there’s something wrong with the design. (It may turn out to be a calculated tradeoff, of course).