BY "seen things" I mean observation products ( with the appearance of material things) generated by the observer. Which could be an organism or a device or technological system or sensitive material.
Existence being uni-temporal, the pattern remains simultaneous whether the entropy of its constituent parts is increasing or decreasing. It is only the spatial arrangement of the configuration of existence that is altering. Erosion and deposition of silt can be happening simultaneously in different parts of the same river The engine cylinder of one car on a road can be compressing while another cylinder in another car is simultaneously being driven to expand because of the explosive combustion of the petrol within. Only what is, is materially real. Former material configurations different to the pattern at uni-temporal now have been superseded, so don't exist.