Mac OS X Stacks are continually-updated lists of folder contents that can be expanded from a single icon on the Dock.

mac-osx-dock-stack-hilte-1

To display gradients behind Stack items as the mouse is moved over them, open a new Terminal window and enter these commands:

defaults write com.apple.dock mouse-over-hilte-stack -boolean YES
killall Dock

mac-osx-dock-stack-hilte-2

To reverse the change, open a new Terminal window and enter these commands:

defaults write com.apple.dock mouse-over-hilte-stack -boolean NO
killall Dock
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