"Designed by an engineer"

The city of Lausanne is very proud to have the first swiss subway system (opening very soon). After two years of constructions, some new urban elements are appearing and it's funny to see the pride of the persons who took care of that. See for example this stunning sticker that is pervasive around the new subway entrance: "Designed by an engineer"

It basically says "Conceived/designed by an engineer", I wonder about the background decisions that led to this sticker campaign and find it utterly fascinating. Also what will be people's reaction? Does that make you more confident before taking that elevator?

Of course, I am always thinking how OTHER stickers (such as "Designed by a crocodile wrangler" or "Built by a chicken sexer") would do.