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The Hollow Earths are a group of seven planets that follows a set of laws of physic different that those that we know, especially regarding Gravity.
They have a special affinity with the Obscure Cities, and the Tramway 81 runs in several of those worlds 1). Time is divided in Period, Cycle and Lombe.
At least one of those planets, Olive's, seems to be of artificial origin 2).