Talal said:
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Yes, it's a bit freaky when you realize it can spin back an forth in different directions. Take a break and try again later, try to think that it's spinning the other directions and only use your non dimate eye. Sometimes it helps to adjust the angle, like you are looking up at it, then slowly bring more afront.
There are other ones like that too:
What do you see? And old woman or a young lady?