A floating world

The universe we seeing playing out in space and time may be just the surface level, where we float like little boats while leviathans stir in the deep.

-- from Is Dark Matter a Glimpse of a Deeper Level of Reality?

...If you notice the floorboards in your house are sagging, as if there is too much weight on them, you might conclude there is an 800-pound gorilla in the room with you. You see no gorilla, so it must be invisible. You hear no gorilla, so it must be silent. You smell no gorilla, so it must be odorless. After a while, the gorilla seems so improbably stealthy that you begin to think there must be some other explanation for the sagging floorboards—the house has settled, say. Likewise, perhaps the laws of gravity and motion which led astronomers to deduce dark matter are wrong...