You can see a lady spinning in this picture.
If you see her spinning clockwise, apparently it means that your right brain is active and vice versa. And I can assure you that it is possible to see both directions.
You can even change her direction wilfully if you try and focus. I can do it. Can you? :-)
If you don't see her spinning click on the picture.
If you don't see the picture at all, see an optician.