Transient types
Click one of the buttons:

The high phi jump can be caused by several different kinds of sudden events, or "visual transients". Besides the sudden replacement of a random pattern or texture by another, uncorrelated texture (click the "Randomize texture button"), we can simply invert contrast—making the light areas dark and vice versa (click "Reverse contrast")—and the jump still looks the same. Another way to set off the jump is to rotate the texture by an angle beyond a certain limit (click "Large step"). Yet another way to trigger the jump is to show the moving pattern to just one eye, and suddenly switch it to the other eye. Some observers can see the jump by simply blinking. However, not all visual transients lead to the jump (for example, sudden flashes in the background do not).