Tate Modern’s current exhibition, titled Global Cities, makes artwork out of population density statistics of twelve of the world’s largest cities.

More:
- Official site for Tate Modern's Global Cities
- Time-lapse film of 18-day build
- The exhibit in photos: Flickr set
- Reviews: 1, 2, 3, 4

The exhibits are really interesting. I cannot imagine a city containing 42 million people - that's almost our entire population (45m) crammed into one relatively tiny space. What a nightmare!

South Africa, am I right? So true, and I cannot imagine how we manage to find ways (high-rise buildings, artificial islands, etc.) to make ourselves fit in such tiny spaces.