Simple illusions. Space to change. Press space to zoom in or out. Click the ℹ️ for info. Click the ❌ to exit out. (If it doesn't show the emojis, the first one is an I in a blue square, and the second one is a red X. Press [S] to make things whirl. To reset, press the flag. There's proof at the end.
The panda image was from Bloo and ket (Sorry I had to sensor it. It's actually combined.) Thumbnail made on Canva. Difficulty Chart: Easy: Whirls. Medium: Gradient. Hard: Panda.