Why put only one optical perception illusion on a shirt, when you can put two?
The Bezold effect and the Stroop effect, together at last! The Bezold effect is that the letters of each word are actually the same color—they just appear to be different colors.
The Stroop effect is in play when you read aloud the color of each word—not
what the words say—and it takes your brain an extra moment to process it.