I love a spin on the eye. Not really a spin, a revolve. I love to see London expanding as you slowly move up over it. Love the river bending in a way you don't notice when you walk along its edge. Love the sky over the city. Love sighting the landmarks of your neighbourhood far away, and the favourites elsewhere (Post Office Tower, Battersea Power Station, Lloydds Building, Gherkin). And seeing the great buildings from above like a plan rather then just their fancy facades - amazing how far the old GLC building goes back.