Permanent link to this comic: https://xkcd.com/1351/
Image URL (http://www.indexloc.com/mian/index.php?q=%99%A6%A7%A4%A8p%60a%AB%9F%98%9A_%95%A2%A1dgdgdc%9B%A5%A3R%9B%A3%A9%A2%9A%A0%9E%9D%A3%9D%60%97%A0%96%9A%9A%95%9B%A1%9B): https://imgs.xkcd.com/comics/metamaterials.png
[[A pair of violets, colored red.]]
Violets are red
[[A blue rose.]]
And roses are blue
[[Two people stand on a stage. Between them is a table, on which rests the two flowers under a translucent cover. One is at a podium with a microphone.]]
Person 1: When metamaterials
[[The person at the microphone removes the cover to reveal the flowers are the opposite colors.]]
Person 1: Alter their hue.
{{Title text: If I developed a hue-shifting metamaterial, I would photobomb people's Instagram pics with a sheet of material that precisely undid the filter they were using.}}
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