The blank page represents God.
He chose the name יהוה I am, to represent that he is self-existent.
In his estimation, when men touch things they pollute them.
- Ex 20:25 And if thou wilt make me an altar of stone, thou shalt not build it of hewn stone: for if thou lift up thy tool upon it, thou hast polluted it.
The untouched blank page communicates the same idea about God's self-existence, and his holiness (untouched).