The power of repetition in photography is shown incidentally in an article in the Guardian Extra today, with
three photographs that have a strong repeat pattern, from the three striped aprons in the first shot; the graphic repeat of the outstretched arms in the second shot, and the pandas ad infinitum in the third.
It is a technique that Margaret Bourk-White used many times, as in this Life magazine cover of the Hoover Dam.
Someone who has never seen a dam might still not know what one looks like from seeing this photo, but they will know that dams are big and powerful.
See this Amp at http://amplify.com/u/7rvs