The summer sun beats down, no breath of wind stirs the hot, hot air. You sweat even in the shade of the cottonwood. And,
Cottonwood leaves are almost always in motion, no matter how still the air.
The tribes of the northern plains revered the cottonwood--big, sturdy trees found in diverse locations, often indicating water. The rustling leaves reinforced the mystic nature of the tree because winds were the path of the Higher Powers and cottonwoods always have those inexplicable little winds moving their leaves. Check for yourself.