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They want to use your gyroscope to synchronize your movement within the store with their mapping of what products are on which shelves.

Historically this has been done by offering free in-store Wi-Fi and then triangulating the movement of cell phones within the store based on their signal strength from the perspective of the various Wi-Fi access point supporting the store’s network, but a gyroscope will even tell them if you crouch down or turn around.

Black-body radiation is an interesting argument against 100% efficiency, but couldn’t you just extrapolate and argue that the emission will be converted back to heat once it stops reflecting and becomes absorbed?

I’ma second. This is officiallly unofficial permission to begin your dissertation on unforeseen consequences. I’m here for this.