When you click something you expect the size of that object or thing become smaller. But in Google Chrome when you click on an app, the icon of that app becomes larger. I'd like to know why Google chrome behaves like this?
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It becomes bigger because they chose to emphasise what you are selecting over trying to match some sense of real world perspective.
I agree with their choices, as it's more important that you emphasise what has been selected than matching what would happen in the real world to a similar object. Modelling digital interactions on real world objects is not always the best choice.