Our current universe is expanding, and distant galaxies are redshifted, with a redshift that increases as the distance to the galaxy increases. After a certain distance, the galaxies move faster than the speed of light, the redshift becomes infinite, and we get a kind of event horizon past which we can't see anything.
Now, how would that look like in a contracting universe? Would further away galaxies move faster towards us? If so, does that mean light would be blueshifted, and the further you look the more shifted it is? Would there be a point past which galaxies seem to be moving towards us at the speed of light? What would that even look like?