I'm pretty sure the temperature of the rhodopsin in your eye was above 30 degrees Fahrenheit :)
A toad's eye temperature can vary because it's cold-blooded. If humans' experience of eigengrau varies with outside temperature, well that's interesting and deserves study.
A toad's eye temperature can vary because it's cold-blooded. If humans' experience of eigengrau varies with outside temperature, well that's interesting and deserves study.