It's actually very clever I think. I know exactly what it does, but I have had a hard time explaining it to people who don't know about analog gain, noise floor

It's actually very clever I think. I know exactly what it does, but I have had a hard time explaining it to people who don't know about analog gain, noise floor and such things. I usually resort to "high ISO makes your camera more sensitive in low light, but the images get smudgy if on too high an ISO".