The next step is using the combination in e-ink fashion, so that you can smoothly regulate the thermal profile as needed.
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Genius. Just imagine.
Honey, it’s going to be -27°C (-16.6°F) tomorrow, can you turn the reflectivity to 0% after brewing the coffee?
You could probably more easily do this with just a flat surface that you can rotate. Smaller the squares the better uniform distribution you can get but if you don't have those strict requirements then why go super small (e-ink)?
You could probably use a scaled-up version of the cable mechanism used in mini-blinds.