ambidextrous, because he wrote and painted just as often with his left
as with his right, and just as successfully.

This seems once more a hazardous statement to make about a remote
ancestor, in the age before the great glacial epoch had furrowed the
mountains of Northern Europe; but, nevertheless, it is strictly true and
strictly demonstrable. Just try, as you read, to draw with the
forefinger and thumb of your right hand an imaginary human profile on
the page on which these words are printed. Do you observe that (unless
you are an artist, and therefore sophisticated) you naturally and
instinctively draw it with the face turned towards your left shoulder?
Try now to draw it with the profile to the right, and you will find it
requires a far greater effort of the thumb and fingers. The hand moves
of its own accord from without inward, not from within outward. Then,
again, draw with your left thumb and forefinger another imaginary
profile, and you will find, for the same reason, that the face in this
case looks rightward. Existing savages, and our own young children,
whenever they draw a figure in profile, be it of man or beast, with
their right hand, draw it almost always with the face or head turned to
the left, in accordance with this natural human instinct. Their doing so
is a test of their perfect right-handedness.

But Primitive Man, or at any rate the most primitive men we know
personally, the carvers of the figures from the French bone-caves, drew
men and beasts, on bone or mammoth-tusk, turned either way
indiscriminately. The inference is obvious. They must have been
ambidextrous. Only ambidextrous people draw so at the present day; and
indeed to scrape a figure otherwise with a sharp flint on a piece of
bone or tooth or mammoth-tusk would, even for a practised hand, be
comparatively difficult.