"We may regard the ether as a ... foam" - Lord Kelvin

It's an old idea: 

"Sir William Thomson (later Lord Kelvin) published his proposal for an ideal foam, intended as a model for the ether of space ..."

Ref. Kelvin’s foam structure: a commentary

“We may regard the ether as a continuous incompressible elastic solid, permeated by a system of spherical vortices… or, more simply, as a foam of equal cells.”(1887)

Ref. A history of the theories ofaether and electricity

Ref. On the division of space with minimum partitional area