Floating Island

Top
The top of Floating Island has a few tall trees and a pond.

Bottom
Inside Floating Island is a cave that is only reachable by Tardis and contains three curious items: a tree that is exactly the same as the tree in the Tardis Chameleon Circuit and two glowing cubes, one blue and one purple, they grow, shrink and repeat; it is unknown what they are.

History
The only known change to Floating Island is the addition of the cubes.