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It really made me start wondering how we can see infrared, ultraviolet and even the x ray light spectrums, but we have yet to do so in the microwave spectrum. It'd be awesome to see the world through such lens. Imagine being able to see through walls with WiFi and cell towers illuminating everything.
https://youtu.be/jibvu9BHV_k?si=Q80rb2tB_Cz0TdWM
Totally not book related but your comment made me think of it... Good episode on colors.