Bolards: an elegant defense for more noble times

OK, it is always a bad idea to paraphrase Obi Wan Kenobi, but during my recent trip to Marseille I thought for a bit how some things never change. In the middle ages, villages and cities used stone walls to protect the people inside against invaders — and, by the way, to more effectively and efficiently kill those who would try to invade. And today, bolards are used to protect the people inside against terrorists. Maybe we can define “progress” in this sense, because today we build infrastructure to keep the terrorists out, not to kill them.

As an IT guy, I am wondering if we could call this a design pattern?

Here is a barricade I spotted guarding the pedestrian area of the Vieux-Port in Marseille:

And here is a nice snap of the Barricade Man opening it, so a water spray truck can drive inside and spray water everywhere. The French really don’t feel comfortable unless the streets are sprayed with water on a regular basis.