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Quick Look is a quick preview feature which was introduced in Mac OS X 10.5 Leopard. Quick look allow us to preview the files, multiple page documents and video with opening them. You just have to select the files in the Finder and press the Space bar to preview it.
Today, i will going to show you a trick on Quick look. This trick called X-Ray Folder. This feature is hidden by default. We need to enable it through Terminal. Normally when we Quick Look on folder, it will show the regular folder icon. But if you enable X-Ray Folder feature, the folder icon will be semi-transparent, with previews of the folder’s contents visible in the Quick Look window.
Let see the screen shoot without enable X-Ray Folder
Screen shoot with enable X-Ray Folder
How to enable X-Ray Folder
1st – Quit the Finder via Activity Monitor
After that, launch your Terminal and enter this command:
defaults write com.apple.finder QLEnableXRayFolders 1
Done 
How to turn off X-Ray Folder
Just repeat above steps and enter the same command with change 1 to 0 in your Terminal:
defaults write com.apple.finder QLEnableXRayFolders 0
[...] panel updated for Snow Leopard But if you want to do it via terminal the instructions are here: How to enable X-Ray folder previews in Mac OS Quick Look | Tech Kaki You can also see what the transparent folders look like in [...]