How do they make this spinning-optical-illusion?

Answer:
They make it bye creating a perfect pattern of colors and making them so they slower change there position causing the brain to think the picture is moving
Explanation:
Can i have brainly, thx and tell me if right?
Answer:
the closer to the middle the things get, they make them smaller and smaller
Explanation:
when they get smaller they look farther so it looks like a tunnel