Consider the toaster of Example. Design a set of icons that will make the setting unambigu...

Consider the toaster of Example. Design a set of icons that will make the setting unambiguous.

Example

The Hard-to-Read Toaster

The common electric toaster invariably has a control to allow the user to adjust the lightness or darkness of the toast. The toaster control section shown in Figure has white printing on a black background. Can you tell which direction produces darker toast: clockwise or counterclockwise? On the one hand, one might think the black toast icon means “darker.” On the other hand, because the printing is white, the white toast icon might mean “fully colored in,” hence darker toast. You?ll have to buy one of these toaster to unlock the puzzle.

Figure Toaster control knob with confusing markings. Which icon suggests darker toast, the all white or the all black?