Time fixes us to this dimension. Distance fixes us to our world.

Scale is a means to move beyond our world. If you make yourself small enough you can pass through a wall: The Space Between Points. 

A wall is a human-made invention to keep humans apart and the environment out. It works -- as that. It is a reality. It is real to humans.

A highway allows human-made vehicles to get from one place to another in a more rapid way. It is a barrier to animals trying to get from one place to another. These are separate realities. It is real to humans and animals for different reasons.