Here again scale is key. Note the G is not floating on a large wall (which would be the natural instinct) No. It's framed by a much smaller wall that without the letter, would be doing nothing. Instead the graphic pulls the eye into the space. Also note the primitive elements build up to it and over lap it slightly to ground the entire tableaux. The intentional thought is extreme yet not forced.
I sent this to my teacher friend. A website that has simple alphabet print outs, upper and lower case. they can be as small as a page or as big 16 pages each. All depends on your selection. And they are big enough for you to let your students draw in them (as seen here)