It's not meant to be pointless, it's for people with impaired vision (inverting colours can help sometimes with reading etc).
If you have the latest software update (10.4.8) then hold down ctrl and move your scroll wheel on your mouse (or ball if you have a might mouse, or 2-finger scroll on notebook)
shift + apple + 4 then click and drag. Check the new file on the desktop.
then try:
shift + apple + 4 let go and press spacebar. Now move the pointer over things like windows etc (check icons and the clock too) - Click and check desktop!
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