If time were flowing backward, it would imply a reversal of the arrow of time, where cause and effect relationships would be inverted. In such a scenario, if we assume that all other laws of physics remain the same, the world around us would appear to be going backward, while our perception of events would likely remain the same.
Our perception of time is deeply ingrained in the way our brains process information. We experience events unfolding in a particular sequence, and our memories are formed based on that linear progression. If time were to flow backward, we would perceive events in reverse order compared to what we are accustomed to. For example, a shattered glass would appear to spontaneously reassemble itself, or a melting ice cube would freeze and become whole again.
However, it's important to note that this is a thought experiment, as there is no scientific evidence or empirical basis to suggest that time can flow backward in our universe. The arrow of time, as we understand it, moves in a forward direction, following the second law of thermodynamics, which indicates that entropy (a measure of disorder) tends to increase over time.
While there are phenomena at the microscopic level that can exhibit time-reversal symmetry, the macroscopic world we observe on a daily basis is governed by the arrow of time pointing forward. Our perception of time is intimately tied to the fundamental properties and processes of the universe, and a reversal of time's flow would entail a fundamental shift in those properties and processes.