In the glass facades of corporate office buildings, I photographed the reflections of other such buildings, which festoon Houston, TX.
To produce these images, I converted the originally color photographs into black-and-white, then boosted contrast. From these, I created line pictures (with what is called *edge* in my software, using a "Roberts" transformation), which I then converted into negatives, whose contrast I adjusted to bring out the building's structure. The resulting lines, I then tinted to taste, often choosing zany colors to contrast with the humorlessness of these edifices.
The former Enron building provided the mirror here.