That is philosophy, not physics. We describe what matter does with physics, not what it is. Personally I think the "void", the Buddhist concept, fits the bill n

That is philosophy, not physics. We describe what matter does with physics, not what it is. Personally I think the "void", the Buddhist concept, fits the bill nicely. Objects are created from the void and from those objects all possible objects are created. All of mathematics is expressed, and in one corner of that infinite structure lies our universe.