What the hey? A two-story bicycle?

I was driving home from a bit of shopping when I saw a very strange bicycle approaching, one that was twice as tall as a regular bike, with the rider seated way up high above traffic.  Just now I did some web searching and apparently this is an actual thing that people make.  The Wikipedia article says it’s considered safer in traffic because of the high visibility and “wow” factor, but I was concerned that the “What the hell is that?” factor could make traffic accidents more likely.  As for myself, since it was a narrow street, I just pulled over to the side to give him room to get past and stared in bewilderment at the contraption.  And somehow it seems to me as I write this that a double-decker bicycle is more worthy of the word “contraption” than most things would be.