This article from AwesomeInventions.com, “Water-Activated Street Murals Come to Life When It Rains,” has great photos as well as explanation:
https://www.awesomeinventions.com/water-activated-street-murals-pantone-project/
The murals use hydrochromic paint, which you can buy online. (Now all you need are a street and some rain! 😉)
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