Garrick Mallery,
Pictographs of the North American Indians…
“ One very marked peculiarity of the drawings of the Indians is that within each particular system, such as may be called a tribal system, of pictography, every Indian draws in precisely the same manner. The figures of a man, of a horse, and of every other object delineated, are made by every one who attempts to make any such figure with all the identity of which their mechanical skill is capable, thus showing their conception and motive to be the same. ”
