Men seeking same-sex encounters transformed the pissoir into something its planners never intended. Who ultimately determines the meaning of a public space: its designers, authorities, or the people who use it?
The law determines that public space can't be used for any sexual activity.
I'm not sure what constructive classroom discussion you can have when the example is based on the law being broken.
Classrooms teach about reality (among other things) and there are many things in reality that don't involve obedience to the law, as it exists at a particular time and place.
See also: https://en.wikipedia.org/wiki/The_purpose_of_a_system_is_wha...
Follow-up question: Does an enclosed stall count as "public space"?
Look at the photos in the article, they weren't enclosed stalls. Its elegant in a way, just a couple feet of opaque material that wraps the beltline of a central aiming point. Basically as good as going on a tree but without people getting uptight.
When it's one person, true, but when it's a population, the politics historically changes and the law accedes to pressure to stop enforcing that determination.