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Radioactive lines
---Bright illusionary lines!
When you stare at the circles, you can see some bright radioactive lines occur, just like the disc reflection. (BTW, I think it works better when the picture is small.)
You can see the edges of squares concave and circles appear to be rhombus-like, but still with arcs. You can also see the bright radioactive lines occur at the place where lines meet. (8 obvious ones and 8 subtle ones)
Bright radioactive lines are easier to see in this two pictures. (V.S. last one)
The black part will get brighter as you constantly staring at the picture, and the radioactive lines will create an illusion that make it looks like a fast-spinning fan.
