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2022-08-28 17:15 dustin  
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in dsm dash 166, we see a "conveyor belt" of three fireflies moving in a 2x3 rectangle.   
  
the formations in this cave show conveyor belts of 4x2 or 2x4 size.  
  
top-left and bottom-left: two fflies/bflies just spinning, but it looks like each of them moves in the whole 4x2 rectangle, which is an optical illusion. (so these are no dnacing fly stagnations.)  
  
formations in the middle (those which can be fully seen when the cave is started):  
with the help of three flies of the opposite type, the conveyor belt can be made real! now the fireflies (top row) / butterflies (bottom row) really use the whole 4x2 / 2x4 rectangle to move. so these 8 formations are indeed dfs's because the flies get influenced.  
  
right column: these two formations follow the same principle but they're visually less spectecular because one of the three influencing flies has the same type as the conveyor belt flies.  
  
btw all the 6 columns are mirrored pairs (the way  Arno  defined this in his thread about dancing fly formations)! :d

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2022-08-28 22:41 Arno  
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very nice compilation! :-D

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2022-08-29 03:27 dustin  
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thx  Arno  :) the next two episodes feature more and different optical illusions related to conveyor belts :d