As for the biomes? Well, they're huge. You could fit the Tower of London in the Eden's Rainforest Biome, which was why the Guinness Book of Records named it the world's biggest conservatory. They're also bubble-shaped, because the former quarry site was highly uneven, and the domes could accommodate the irregular terrain. The biomes are in fact based on the Pillow Dome, a structure invented by one of Fuller's students, J. Baldwin. (Bonus points to Doctor Who fans who recognized the Rainforest Biome as the set for The Waters of Mars.)

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Today the Eden Project functions as a tourist attraction, social enterprise, and foundation for environmental education. Classes on climate change and sustainable gardening are regular events; while the next few weeks will see concerts by The Flaming Lips, rock-climbing on the biomes' cliff faces, and a talk from the host of BBC's "Grow Your Own Drugs."

It's come a long way up from its origins in a defunct clay pit. You could even say the landing of these otherworldly structures in an unlikely corner of the UK provide a fitting response to one of Fuller's most challenging statements: "The most important thing about Spaceship Earth - an instruction book didn't come with it."

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The Eden Project is no book, but through its interactivity and focus on constant learning, perhaps the recently landed hexagonal spaceships will teach us something about our own earth, after all.