✦ How/What? ✦

✦ Stare at the center of the illusion for 20-30 seconds and then look at something else, you'll see the effect transfer to your surroundings ✦

✦ How/What? ✦

✦Move your head back and forward looking towards the center and you'll feel like the glow is....well growing!✦

✦ How/What? ✦

✦ Stare at the center of this illusion at the + sign and eventually all the circles will disappear and only the sign and the moving circle will remain. ✦