Imagine a universe without time, or more specifically without the *Flow of Time*. Everything will be a 2D projection and nothing more. No movement, no interaction, and in other words no *Change*. 

But our universe is not like this. We have movement, we have interaction, and our world changes in many ways. But there is a catch. We have some **0** mass particles in our universe, which move at the speed of light *e.g.* photons and, according to the theory of relativity, these particles are not affected by time. So the universe is static from the point of view of a photon. 

But it can't be like this. Our world is dynamic. And this kinda raises a contradiction. On the one hand, the universe is static and in another the universe is dynamic. Can anyone explain this?