If you have never given it thought it will surprise you to notice
how much of our thinking is in picture form. The architect sees the
completed building, sees it in detail and puts this creation of his
brain on paper to guide the builder in reproducing it. The engineer
sees the completed bridge spanning the chasm before a workman has
turned a hand to rear it. All successful captains of industry think
largely in pictures. Children do so naturally and lose the ability by
lack of use and substitution of the "more modern methods," some of
which are most detrimental. See to it that your children appreciate the
value of visualization, that they use it continuously in their thinking
and study.