The color of the brown is also not the same: in addition to the several pixel transition area which depends on the stripe color there are slightly red, green, a

The color of the brown is also not the same: in addition to the several pixel transition area which depends on the stripe color there are slightly red, green, and blue tinted patches in the rest of the brown that differ based on the stripe color, which helps create the neon glow effect. Calling the balls all the same color seems to be entirely incorrect. I also see an "egg" illusion where it looks like the lower left of the ball is actually flat but the rest is a dome.