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2022-08-29 14:20 dustin  
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technically, this is yet another variant of the conveyor belt but there's another optical illusion!  
  
the top-left small formation shows two siamese twin fireflies who stay together all the time and make loops together. but actuallyone of the two "twins" is exchanged once per loop! in reality, two fireflies build a (true) conveyor belt while the third is freely spinning.  
  
top-right big formation: extended version. it can be extended as much as you wish! :d  
  
bottom formations: mirrored pairs with butterflies in the role of the "fake twins".  
  
next episode: another optical illusion, by far the craziest i could make with the "conveyor belt" theme! :d

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2022-08-29 14:22 dustin  
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instead of "top-left formation", i should perhaps say "top middle" because at the top-left there's empty space :d

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2022-08-29 18:30 DarkStoorM  
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The bigger formations are so confusing! :D when you look at them, it looks like a pair of flies is intersecting with another pair, where one just goes through another! It also looks like a pair i spinning together in the same direction. or even better, for example at top-right, firefly goes up, makes two half-circles and goes down, then the same on the way back :D

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2022-08-29 19:53 dustin  
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yes indeed, i find it very confusing too! hard to say what my eyes / brain really see there... :d

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2022-08-29 19:55 dustin  
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but that's nothing, wait for the next one! :d