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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A MARTA operator is seen inside the control room of one of the new MARTA trains during the unveiling of these trains on Thursday, Jan. 30, 2025. (Miguel Martinez/AJC)

Credit: Miguel Martinez-Jimenez