@expatpaul That's still not what people are debating. And I thought the variation in perception of colour was something everyone knew intuitively because of stuff like worse colour perception in bad lighting etc. Or for that matter, this age-old (pre year 2000?) massively shared optical illusion of a rotating "green" dot: https://social.umeahackerspace.se/attachment/28422
People sharing the dress image should all just open it up in their favourite image editor and be done with it. Considering that it's not just "random people" posting and repeating this non-conundrum but huge media outlets who should have analytical thought embedded into their work ethic.