Anyway, imagine he has a piece of really long wire. He can make the wire into any 2-d shape he wishes - a line, a triangle, a square, a pentagon, a hexagon... etc. or a star, or an L-shape, or any other shape you can imagine.
No matter what Fred does, he can't see through the middle of the wire.
Now suppose Bob takes this thin piece of wire, he can see straight through it, because he has an extra dimension. So, Bob thinks about whatever interesting shape Fred has come up with, and decides to cut out a large sheet of paper, and fold it so that the wire lies just along the outside of the paper and all points on the wire are in contact with the paper. He then folds the paper up so it is a hollow object with no holes.
So now, Bob can't see through the paper, and nor can Fred, if he happens to intersect it with Fred's planespace.
And guess what - Emily takes the paper, and is able to see straight through it. So, she does the same as Bob, and takes an even larger swock, and folds it up so that the paper lies just along the outside of the swock, and (somehow) all points on the paper are in contact with the swock. After folding the swock up, she has yet another hollow object, which neither herself or Bob or Fred can see through.
Now, just for a minute forget about Emily's object, and imagine that she gives Bob's paper back to him. He decides to intersect it with Fred's planespace so that the edge of it lies on his plane where it will form a solid object at the intersection. Fred suddenly sees a solid object, the same shape as his wire, appear in front of him. He tries to bend the object, but he can't so he knows it's not the wire.
So, Fred goes off to his garage to get a drill, and drills a big rectangle through the object. Bob decides he doesn't want his inventions ruined, so takes it back from him. He sees that a rectangle has been cut out from one side.
Now, back to Emily's object. She decides to do the same that Bob just did, so intersects her swock with Bob's realmspace, and Bob tries to bend what looks like paper that had appeared right in front of him. He can't, so he knows it's not paper. He does the same as Fred and drills a hole through the object. When Emily takes the object back, she sees a big cylindrical hole running along one "cell" (is that what a 4-d face is called?)of her object.
------------------
Ok, would that all happen, by analogy?
Whee, my longest post ever made
