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Quantum foam or spacetime foam is the fluctuation of spacetime on very small scales due to quantum mechanics. The idea was devised by John Wheeler in 1955. With an incomplete theory of quantum gravity, it is impossible to be certain what spacetime would look like at small scales. However, there is no reason that spacetime needs to be fundamentally smooth. It is possible that instead, in a quantum theory of gravity, spacetime would consist of many small, ever-changing regions in which space and time are not definite, but fluctuate in a foam-like manner. Wheeler suggested that the Heisenberg uncertainty principle might imply that over sufficiently small distances and sufficiently brief intervals of time, the "very geometry of spacetime fluctuates." These fluctuations could be large enough to cause significant departures from the smooth spacetime seen at macroscopic scales, giving spacetime a "foamy" character.
Wikipedia, The Free Encyclopedia

Breathe, breathe in the air
Don't be afraid to care
Leave but don't leave me
Look around, choose your own ground
For long you live and high you fly
And smiles you'll give and tears you'll cry
And all your touch and all you see
Is all your life will ever be
David Jon Gilmour, Richard Wright, and Roger Waters, Breathe

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