have found a couple strange ones while killing time, hopefully these ones are ones you have not seen before.

for this one, stare at the center

[spoiler] supposedly the dots will disappear if you stare long enough [/spoiler]

in this ones, the lines look bent, but are actually straight

the last is a tri-zonal space warper

you are supposed to stare at the center for about ~30 seconds.

Warning: might make some people naseous.

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