Over the years, I have recieved this and still think it's pretty cool.
Your eyes will play tricks on you.
I'm sure the lines are straight but they sure do look bent, don't they?
I haven't seen this in a while, so it took me a while to find the spelled out word. Hint: It starts with an L and tilt your head to the right.
This should be in better focus but you might still see the circles moving. Now isn't that crazy?