Minds and Events

[Angrboda]

As noted, perception is a representation of the percipii, not the actual space-like separated events, therefore it is not bound by the laws of relativity.  The pivotal argument fails.  Moreover, the eye and the brains processing of U occur with a high degree of parallelism, which can create the appearance of simultaneity by generating near simultaneous results which are then incorporated into one representation of U.
In regards to the above
Again what is the representation built of in a given instant in time?

The representation isn't built in an instant and uses parallelism, as noted.