Change the Mac OS X Dock from 3D to 2D in Leopard & Snow Leopard
The appearance of the new Dock changed in Mac OS X 10.5 Leopard which has caused somewhat of an uproar in the Mac community, some of whom even claim it looks like it belongs in Windows Vista. That change stuck around in later versions of OS X as well.
If you’re totally insulted by the new 3D dock, or if you just prefer the old Dock appearance, it’s very easy to change and you don’t need to be a super Mac genius to figure it out. Simply launch your terminal and type the following commands:
defaults write com.apple.dock no-glass -boolean YES
then you will want to kill the Dock to relaunch it without the glass effect:
to get the reflective 3D Dock back, simply type the following:
defaults write com.apple.dock no-glass -boolean NO
again, you will want to kill the Dock to relaunch it. Enjoy!
This command works in OS X Mountain Lion, Lion, Leopard, and Mac OS X Snow Leopard, newer versions of OS X will need to use an app like cDock to modify the appearance of the Dock on their Macs if desired.