Wellll, I dont really see what difference it makes whether he can judge the altitude or not, any pilot with a lick of sense for safety should know that there is an inherent risk there, and it shouldnt be done over a bunch of HOUSES in a CITY! I've got a bunch of hours flying at low altitudes, both ag flying and pipeline patrol, and theres just some things you dont do close to the ground unless you're mentally deficient in some capacity.