Ok, this brain game is freaky yet amazing at the same time.
1) Look at the dancer below and see if she's going clockwise or anti-clockwise.
If you see her go anti-clockwise at first, that means you utilise the left side of your brain more.
If you see her go clockwise at first, then you utilise the right side of your brain more.
Now here's the freaky part: you might notice at some point that she changes direction. IT IS NOT THE COMPUTER DOING IT RANDOMLY! It's your brain that decides which direction it wants your eyes to see!
Seriously! If you don't believe me, then try to get someone to look at this together with you on the same screen. You'll find that at times, you'll see her going in 1 direction, while your partner sees her going in the other direction....at the same point in time! I tried it together with Martin, and it was freaky... .
The thing is, if you look at it long enough, you will be able to control the direction you want her to spin in. So here's task#2:
2) Make her do 10 x half-spins in a row!
It is possible....once you find the "sweet concentration spot".
(hint: for me, and I guess most people, it is the foot that is sticking out...but as I get better at it, then her other foot and the shadows are also my "sweet concentration spots")
Anyway...have fun. The human brain is amazing :o).