Daily Brains: five colours flash up and vanish — paint each one back from memory with a hue ring and two sliders. Scored by how different the two colours look to the human eye (CIEDE2000). Monday is gentle; by Sunday the looks are a blink and the rounds turn into afterimages and colour illusions. A colour-memory test in the spirit of a paint-matching challenge, with streaks and a spoiler-free share line.
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