In Rovelli's book The Order of Time, he often refers to blurring. Can you help me to understand what he means? 

He says we observe the universe from within it, interacting with a minuscule portion of the innumerable variables of the cosmos. What we see is a blurred image. This blurring suggests that the dynamic of the universe with which we interact is governed by entropy, which measures the amount of blurring. 

What does this really mean?