LOL, i've tried picturing that too! and what i came up with is some poor caveman got chilly in the late fall temps and needed a fire for warmth. he gathered up these log-looking things and tossed em into the fire and bitched as the smoke followed him around the fire pit circle...but only for a short time. soon he didn't care about the smoke, in fact the smoke only added to his feeling of well-being, he realized...and the rest is history.