There are occasions, with time on your hands, when just just fancy a few good brain teasers a bit like these .....
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| How many rings? - wiggle your screen for rotation |
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| More rings? - wiggle your screen for rotation |
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| Look at this for several seconds and the stairs my flip for you |
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| Wiggle the screen up and down |
If you have the time to look, here are more sites .....
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