Tone. In this interface for the Sony Ericsson, tone is the major factor that allows a user to select their function of choice. Shown, a camera icon is illuminated in a light that contrasts between the other icons that are in darkness. Also, the name of the function choice is in a much brighter shade than that of the icons as well. The effect is that the user knows what they are about to select with the cue besides that of the icon -- the name of the function.

image from: http://sefanboy.com/2007/11/26/k850-menu-interface-in-k810k800/