This could also go fro the get-pushed challenge (see below). But this one might also work for the Eye of the beholder 87 challenge.
Get-pushed challenge description: "focus on repetitive geometry. this can be lines or shapes and should include reference to light and shadow. The feature may be man-made or naturally occurring but should have some artistic merit.. As a subsidiary challenge, there should be good attention to detail in terms of basic technique (horizon, if appropriate, focus, angle of view, composition, light and shade, high/lowlights, tones and saturation etc)."