People.

Day 2 of the games - the Excel looks pretty different with people walking around it. With it being 700m long it'd been very empty before the crowds came. Having said that it's harder to carry a tripod on your shoulder safely with so many people. This isn't even half as crowded as it got on some days.

This was also day 2 of me watching judo. I now know more about judo than I ever thought I would.