THE BREAKDOWN:

You've got a circle, triangles and connected lines tracking your mouse position.

You've got the circle, lines and background tracking your mouse's X position, which is determining which side of the greyscale those shapes are colored.

You've got 3 constantly flashing, RGB circles bouncing around your mouse.

You've got consisting of a for-loop of rectangles, light green verticals vs light blue horizontals, and an ellipse-grid for-loop made via color experimentation.

You've got Spongebob and Patrick doing a drive by color shift.