Editing Ambiguous image (section)

===Extremal edges and relative motion===
[[File:Schroeder's stairs.svg|thumb|[[Schroeder's stairs]] ]]

An extremal edge is a change in texture that suggests an object is in front of or behind another object. This can be due to a shading effect on the edges of one region of texture, giving the appearance of depth. Some extremal edge effects can overwhelm the segmentations of surroundedness or size. The edges perceived can also aid in distinguishing objects by examining the change in texture against an edge due to motion.<ref name="Wolfe"/>

====Using ambiguous images to hide in the real world: camouflage====
In nature, [[camouflage]] is used by organisms to escape predators. This is achieved through creating an ambiguity of texture segmentation by imitating the surrounding environment. Without being able to perceive noticeable differences in texture and position, a predator will be unable to see their prey.<ref name="Wolfe"/>