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Comments on Puzzle #20320: Optical Illusion? Just an experiment...
By l terrell (laterrell)

peek at solution       solve puzzle
  quality:   difficulty:   solvability: line & color logic only  

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#1: Bob Sandrew (lemonpie1101) on Nov 10, 2012 [SPOILER]

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#2: Julia Stanfield (stanfield.julia) on Nov 10, 2012 [SPOILER]
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#3: valerie o..travis (bigblue) on Nov 12, 2012
yes, i agree with julia .good one terrell :)
#4: Alan Lafond (Cural) on Aug 13, 2026 [SPOILER]
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#5: Courtenay Footman (Courtenay) on Aug 13, 2026 [SPOILER]
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#6: Jessikitty Rose (jrosemarsh129) on Aug 14, 2026 [SPOILER]
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#7: Jessikitty Rose (jrosemarsh129) on Aug 14, 2026 [SPOILER]
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#8: Kristen Vognild (kristen) on Aug 15, 2026
my former painting professor called this "spontaneous contrast." The same color can look vastly different, depending which other colors are next to it.
#9: Joanne Firla (JoFirla) on Aug 16, 2026
When I take my glasses off, this thing turns into a 3D image and the middle gets closer. Wild.
#10: Jessikitty Rose (jrosemarsh129) on Aug 16, 2026
Joanne, do you know what your prescription is? Mine is about -4 for both eyes.
#11: Valerie Mates (valerie) on Aug 16, 2026
Courtenay - Is there anything that I can do to make webpbn's red and green work better for you? Adding patterning, or making one a tad lighter and one a tad darker, or anything like that?

(Anybody else who is colorblind or who knows about colorblindness, please feel free to chime in. Thanks!)
#12: Jessikitty Rose (jrosemarsh129) on Aug 17, 2026
Valerie, I'm not color blind, but when I'm checking contrast I use this website (any ADA compliance color contrast checker works):
https://webaim.org/resources/contrastchecker/

Right now, #02B101 and #FF0000 give a contrast ratio of 1.38:1. I don't know what a desired ratio would be for webpbn, but you could get it to at least 3:1 without the current puzzles looking super strange by using #01D701 and #D10000.
#13: Valerie Mates (valerie) on Aug 17, 2026
Thanks Jessikitty -- that helps a lot!

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