YouTube user CharlotteSummers posted a video of a color-changing cake icing technique in which one cake's frosting changes colors when viewed at different angles.

It's not an illusion.

The key?

Airbrushing ridges of the cake frosting at a specific angle to your liking then applying other colors at the ridges on the opposite side.

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Waymo autonomous vehicles operate across 65 square miles inside I-285 and have been involved in six incidents with Atlanta Public School buses since May. Waymo issued a recall because of their cars briefly stopping or slowing down before continuing forward while a bus was stopped and flashing its lights. (Courtesy of Atlanta Public Schools)

Credit: Courtesy of Atlanta Public Schools