On the way back from getting burritos at El Farolito (among the best burritos in the neighborhood, in a hole in the wall at 24th and Mission), I noticed some mosaics in the sidewalk on Mission at 23rd. I don't know how long they've been there. I'm not very observant most of the time.

They're each about 4 feet by 12 feet. The first one reads: "10111". The second one reads "XXIII". The third reads "=+(symbol which looks like an equals sign with a third, slightly longer, stroke between and parallel to the other two)".

I'm sure there's no signficance to this.