Mac OS X v10.5: Using a Multi-Touch trackpad to adjust icon sizes in the Finder or a Cover Flow view

On a portable Mac that has a Multi-Touch trackpad and Mac OS X v10.5.6 or later, you can use two-finger pinch open and close gestures to adjust icon sizes in a Finder window, on your desktop, or in a Cover Flow view. Note: This capability was enabled by default on MacBook Pro (Early 2008) and original MacBook Air and computers with Mac OS X v10.5 through 10.5.5.