When we accelerate photons in the double-slit experiment, they do not move forward in space, but time. Matter’s medium is space. Light’s medium is time. When light accelerates, it enters the future.
When light enters the future, time dilates. Conversely, when light enters the past, time contracts. Energy is matter where the arrow of time is facing forward or out (yang). Matter is energy where the arrow of time is facing backward or in (yin).
But we don’t see the “full spectrum” of the future. We only see one future: the future we enter. The future we become.
If time is a sphere comprised of all points equidistant from the Big Bang, and the spheres increase in size as time moves forward, each of time’s arrows—each individual universe—would be a line extending outward from the Big Bang, piercing the spheres. And the relationship between matter and time, between the line and the sphere, between the past and the future—would be pi.
According to this model—which is hypothetical, so we do not yet know what merit (if any) it holds—the set of time’s arrows could be envisioned as similar to a Koosh ball.