[[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.}}