Reality is a sphere of perception experienced at the "I", which is the center of the sphere.
Perception happens sequentially as an eternal flow of presents. Such flow, the sensation of change, is what we call time.
The order in which those perceptions are sensed or can be potentially sensed is what we call space.
Thus, the sequential organization of perception is what defines the geometry of the sphere of perception: space-time.
Time dilates in an inverse proportion to the distance from the center of the sphere.
Space contracts in an inverse proportion to the distance from the center of the sphere.
If I am standing ten feet away from a car that passes me at sixty miles per hour, the car looks big and fast; if I see the same car from the air, let's say a mile away, it will look small and slow.
The field of perception is spherical because it is symmetrycal.
Due to the inverse relation of space and time relative to the center, the sphere is asymptotically unbounded like M.C. Escher's Angels and Devils.