To do this, visitors build a physical city with building blocks on a large table. But these blocks are magic. As you place them on the table, they light up. At the same time, each block generates a 3-D building on the giant screen behind the table (6 metres high!). A twist of the block changes the nature of the building (a vertical farm might become an eco-apartment block, or a giant corporation) and by moving and twisting the physical blocks, the 3-D generated city is changed in real time.