Block universe theory How to make sense of change in static block universe if every event already exist in block? if you say it's an illusion created by brain even that requires forward evolution of patterns of information in our brains,so what constitutes this change? If everything is just what it is in block and past, present and future exist simultaneously
then how is there any change at all?
 A: Look at a painting. The left is different from the right, the top is different from the bottom, and yet (if the painting is of something coherent) every little bit of the image is related in some way to the little bits on either side of it.
Look at a movie. The beginning is different from the end, but (almost) every frame is related to the frames before and after it, there's just a little bit of motion and change from one to the next. You can watch the movie from beginning to end, but you can also pop it out of the player, carry it around, put it in, rewind it, watch it later. The movie as a whole isn't changing, just the picture we see as we "move along its time axis".
Now look at the universe. Arguably it's just like the movie, except:

*

*It's four-dimensional (at least).

*There is, so far as we know, no director and no jump-cuts except for maybe the big bang. Every moment in time is related to the ones before and after it by what we call the "laws of physics".

*We're stuck inside it, watching from the inside. Our act of perception is just another event occurring inside the universe, governed by its laws, which control how information reaches us along the time axis. My perception of "now" is mostly made up of things that happened near me in the recent past, and not of things that happen in the future, because that's how the universe works.

All of this is compatible with the idea that the universe is a "thing" which, if viewed from the outside, could be seen to contain all of time "all at once", just the way a DVD on the shelf contains the beginning and the end of the movie. But unless we can somehow attain an "outside" viewpoint, or interact with something that has it, it's purely a metaphysical question, not a physical one.
A: You are thinking of change in far too restrictive of a sense. Consider a static cone. Even though the cone is static we can perfectly validly say that the radius of the cone cross section changes from apex to base. The radius is small near the apex and it gets large near the base. This would be described by $\frac{d}{dx}r=k$.
Mathematically, there is no difference between this and $\frac{d}{dt}r=k$. In this case, the latter could describe a circle whose radius is changing over time. Mathematically a dynamic circle which changes radius over time is the same as a static cone which changes radius from base to apex. The block universe simply takes that mathematical fact at face value.
The patterns of activity in our brains are similar to the cone’s radius. Just as the radius of the cone is a property of the cone which varies from base to apex, so the brain activity (voltage) is a property of the 4 dimensional object which varies over all 4 dimensions. There is nothing at all inconsistent with the block universe and the fact that this pattern changes in all four dimensions.
The two views are completely equivalent and you can equally describe the human mental state analogously to a dynamic circle or a static cone.
A: This is not an answer, but questions perhaps you might find related to your issue. The question you asks does not belong to physics, but to philosophy. Physics has nothing to say about the subjective experience (qualia) because it has no effect on the behavior of matter. Some, including Daniel Dennett even claim that qualia is an illusion and actually does not exist. Imagine a different scenario. You have a computer simulation in which the agents inside the program are conscious as we are. Are they only conscious when you run the program? What if you run the program backwards, or run it in individual steps, so it stops for a given time before running the next step. Will these beings experience qualia when the software is run that way? Or if you make a lookup table and the software is run by only reading from the lookup table. Or if the software is run by hand and paper (the famous "Chinese room")?  Or not run at all?
A: As user253751 says in his comment, different points of the block can have different time values.
So you need a direction for time and some kind of wave of time, that progresses in that direction.
Basically the fully determined block universe is being read by the passing time, and we feel this as change.
