macOS app icon stuck on my screen I just tried to open Spotify's Mac app through the OS X LaunchPad, and when I clicked on the icon, the Mac app icon remains stuck on my screen.

I've attached some screenshots to show you. I don't know how to get it down. No matter what I do to the screen, the icon is always stuck "on top" of it. 

How do I make this go away? If you're curious, Spotify opened on the second attempt. The first attempt it just got stuck.
Turns out, I just had to reset the 'dock' process. I opened Terminal and typed

killall Dock


and pressed enter. The screen flashed for a second, and everything came back with my stuck icon gone.

If that fails, the issue may be with Finder (this is the case with the similar issue of Stacks categories "burned in" to your desktop background). Running

killall Finder


will address that.