Quote:Not exactly.   That's only true if you believed the universe is exactly what you see.   All we can verify is what our brain tells us. Like the idea of colors.  Color is just something our brain makes up in order to make sense of the world.  Even the idea of the color "blue" is a relatively recent concept.  The brain does so many things to process and filter the information we sense, things even the biggest supercomputer in the world can't do.  The third dimension could just be another way of making sense of the universe.  

 

As far as seeing 3 dimensions, a wall isn't the best example, but it does seem pretty obvious to us that we are in 3 dimensional space.  But we only know this because of observations based on movement and memory.  If nothing moved there would be no way of verifying we are looking at the universe or if we are looking at a 2d photograph of the universe.        

 

The problem is we don't really know how much magic goes on between the universe and our brain.  

a wall is a a great example...it has length,width and height...That is 3 dimensions you can see with your own eyes and measure all three... You can measure how tall your wall is, you can measure how long it is, and you can measure how wide it is... that is perfect example of a 3 dimensional object. when you can measure length width and height there is undeniable proof that it is 3 dimensional

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