Yup ... Normally, people will argue about whether the lady is spinning to the left, or spinning to the right.
Then suddenly some of them will realise that they can actually control whether the lady spins left or right, and they realise that they can make her switch directions at will.
Then other people will say that the above people are crazy. Then they will get into an angry fight. Someone will try to decipher the computer program. Someone else will ask his friend to stand beside him and simultaneously peer at the screen. Other people will blink their eyes rapidly at the image or do other weird things.
Finally, around this point, I will point out that in fact all these people are looking at a flat computer screen. The lady is flat. In that sense, the lady is neither spinning left or right. You cannot spin in 2D.
All the lady is, is black dots appearing and disappearing on your screen. Essentially, she's quite similar to how reality is merely subatomic particles blinking in and out of existence. The reality of her spinning (left OR right) depends on your perception.
As does reality in general.