What would be the best image/icon to represent transparency?
It should be as compact as possible and fit in a 13x11 area.
I see that I should add more information.
I need this image/icon to be placed on a system button on the Windows OS:
... So I'd rather have something more scalable.
One thing to note... This should be system interface, not my program's so it must be as least symbolic as possible and most straight-forward to the idea/function.
After igor's idea, here are my results: