Population density, Shibuya scramble crossing crowd

The population density in Tokyo is a little over 6000 people per square kilometer, and it is obviously the most densely populated area in Japan.
But what does this mean? I think that the best way to sample such density is to visit the famous scramble crossing from Shibuya during rush-hour… it’s an experience in itself…

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Shibuya Scramble Crossing, Tokyo

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Yesterday’s Japan Photo: Ueno Lotus Pond