Take an shell or bubble. The bubble is strong enough to maintain it's static sphere shape, except when a photon bounces off the inner surface.
A photon fires from inside the bubble.
The inner surface gets pelted by this photon, and the inner surface bounces it back similar to a trampoline bounce. The effect of the bounce on the inner surface pushes the photon back in the same velocity it arrived. The entire inside of the bubble is like this, but strong enough to stay it's static sphere shape. What happens? Does the photon ever escape?
Does the photon endlessly stay a photon in the bubble at this rate? CURIOUS!