Yeah go play with an LWIR camera of you really want to understand the spectrum. For instance, everything becomes a mirror, you can see yourself standing in fro

Yeah go play with an LWIR camera of you really want to understand the spectrum. For instance, everything becomes a mirror, you can see yourself standing in front of surfaces that have better than ~5um surface finish (quite rough sheet metal and such) and clouds appear hot-ish because while they are themselves quite cold, they're reflecting LWIR from the ground, hence why overcast nights are much warmer.