We will never have all the information required to build a full picture of the world. We perceive three dimensional objects as two dimensional projections in our head. We always must lower the resolution of the outside reality in order to make sense of it. What we see of the world is a reconstruction in our heads which approximates the world outside our heads. We can never see an entire object all at once, there is always a part that is hidden. When we look at a building we only see the side that’s facing us. We can perhaps walk around it but we must hold in our memory the sides we’ve already seen and our memory can’t remember all the detail. Then there is the inside of the building, with it’s many rooms and floors, which contain numerous objects. This building and what it contains can never be entirely perceived. Never in our lives will we be able to experience an entire object as it is at any one moment. In the time it takes to walk around a building, enter its interior space and catalogue all the rooms, floors and corridors, the building has changed in some small and insignificant way, which means its not the same as when we started.