In this video, the beeps make you see something that isn't there

In this video, Caltech demonstrates the Rabbit Illusion, a "time-traveling illusion trick." It tricked me.

Caltech researchers have developed these two new illusions that reveal how the senses can influence each other—in particular, how sound can give rise to visual illusions. These illusions occur so quickly that they illustrate a phenomenon called postdiction (as opposed to prediction) in which a stimulus that occurs later can retroactively affect our perceptions of an earlier event.