Concept of introverted space: is extroverted, multidimensional space an illusion?

The quantum-phase-field concept of matter is revisited with special emphasis on the introverted view of space. Extroverted space surrounds physical objects, while introverted space lies in between physical objects. Space between objects leads to a network structure of matter: a network in which one-dimensional space filaments connect massive elementary particles. Missing quantum fluctuations in the finite space filaments are interpreted as `gravitons,’ the exchange particles of gravitational attraction between elementary particles.