The Line. This interface for a TV program video player makes an interesting use of lines. Just the simple use of lines in this particular interface shows movement of sub-menus that further show multiple programs within a channel. These lines show depth and allow a user to realize that there are an abundance of options to choose from. They also make the channel and program the focus of attention.

image from: www.slipperybrick.com/2007/10/sandisk-fanfare/