Use mouse to move around the circle. Press space to change the circle, and press the right and left arrow keys to change the thing in the center.
How it works: It's not the ghost effect. The red/purple circle is actually made of two parts: a whole circle at the back layer, and a layer at the front, where every second pixel is punched out. It makes a pretty weird effect, and the effect changes depending on if you're inside the project, using Fullscreen, and other stuff like that. The costumes 2, 4, and 6 also look super weird in the costume editor when you zoom out
