For those not in the know, Shibuya is one of Tokyo's trendiest and busiest neighborhoods, with scads of gargantuan shopping complexes, restaurants, cafes, multi-story pachinko parlors, capsule hotels, love hotels, and youth out having fun and having dates.
To someone not from here, the crowds are bewildering. We realized that every street we crossed, we crossed with hundreds or maybe thousands of people. Not just once, but over and over. People kept flowing in and out of the neighborhood.
Here is a video of a single street crossing cycle near the Ginza line Shibuya station.