Leibniz' principle and the observational dominance of Euclidean geometry suggest a huge cosmological constant in Einstein's field equations and a correspondingly huge negative “vacuum” density. This theory lends support to renormalization procedures in quantum electrodynamics and to the view that the interactions we “observe” are fluctuations of the “vacuum state” interpreted as a Fermi sea. Einstein's “preferred” equations, with A=0, are recovered. “Empty” space has no metric geometry at all.