Andrew Trice
Notice that there are two things going on here... 1. Animate the opacity to semi-transparent 2. Animate the distance of the drop shadow Applying these two effects creates an illusion of depth within the application. It appears as though the object that you click on is lifted off of the plane of the application, and is dropped back onto the application when you release it. I hope this gives you a few ideas to help you make your own applications more interactive.
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