TYWKIWDBI ("Tai-Wiki-Widbee")
"Things You Wouldn't Know If We Didn't Blog Intermittently."
22 August 2011
The "checkershadow" illusion
YouTube link
.
Four years ago I blogged an image of the
checkershadow illusion.
Now a video version is available.
Via
PharmaGossip
.
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