Ambiguous garage roof illusion.
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Previously:
https://www.homemadetools.net/forum/...392#post222366
https://www.homemadetools.net/forum/...575#post219698
https://www.homemadetools.net/forum/...011#post221078
https://www.homemadetools.net/forum/...121#post214414
https://www.homemadetools.net/forum/...063#post207344
