Some windows in the steam punk city are repurposed to cloak. Here is one that cloaks and one that allows the passage of light but has no view (except of light.)
The next step are the five windows below, which message shunning and blindness. The bricked-in one is the same window as the one to the right above but is a closed hand rather than an open one.
It is a fist. The coloured windows are clouds. All of these windows are perfect expressions of their environment and concentrate it into a series of interhuman codes of body language for which the only appropriate word is art.