If you take a 2 dimesional sheet of paper and rolled it up so tightly that the diameter of the roll was next to nothing, then it would appear as though it were only a 1 dimensional line and would be hard to differentiat between an actual 1 dimensional line.
this theroretically is the same...
You want to check out Brain Greene's work, 2 books he has written
The Elegant Universe - about 4-5 years old (very good elaboration on String and M-theroies
The Fabric Of the Cosmos - only about 6 months old and includes the latest Unified theroies as well the cosmological approch
Brain...
X (XOR) Y = X'Y+XY'
they prolly what you to replace the XOR with inverters, ANDs, ORs
I'm taking Logic design right now so i'll prolly be posting some more questions up here