I was in Brussels most of this week. My room number was 404. How perfect is that! :-)
Anyway, being a geek, it was difficult to gaze upon the beauty and splendour of the Town Hall and its famous architectural anomoly without thinking of it in computing terms.
In commercial IT, it would be known as a "change control item". A flaw that is simple to state yet ... rather expensive to fix.
In commercial IT, we see "buglets" on a par with the Town Hall anomaly on a regular basis. Unfortunately, software is rather abstract and explaining the cost implications of fixes is sometimes very challenging. You cannot simply stand on front of it and say "look!" :-(