One way of drawing the viewer into an image is to have a puzzle, or a fill-in-the-blank, that requires solving. This is particularly effective at stopping the eye when used in advertisements or other locations where there is competition and capturing the viewer’s interest is important.
The image below contains a bit of British architecture, a bit of British weather, and the familiar London Underground logo; but partially occluded by raindrops and mist, forcing the viewer to work, just a bit, at reading the text. How much work is too much? That will depend on how familiar the viewer is with London, and the Underground. For the British, the image could be adjusted to make the logo much more obscure. For others, including Americans, it is important the nearly the entire word is visible, or there is a risk that the viewer won’t succeed in assembling the puzzle.
C. David Tobie