http://www.news.com.au/dailytelegraph/story/0,22049,22535838-5012895,00.html
When I first saw this I could've sworn that it only went anti-clockwise. then I blinked and suddenly it went in the opposite direction and couldn't see how I could've possibly seen it any other way. I thought perhaps some trickery was involved but nope :( I've managed to train myself to switch it at will but it really hurts my head after a while making me feel weird.
How do you see it?
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