In physics,there are four kinds of force and four kinds of space-time:bond force and 3-dimensional space-time,strong interaction exchanging pi-mesons and 2-dimensional space-time,quark confinement and 1-dimensional space-time and weak interaction and 0-dimensional space-time.Newton and Einstein are different observers because of their different interior state.Newton' space-time is 3-dimensional space and Einstein's relativity is 2-dimensional space-time.

from State Space-Time