That was one of my issues with the 10 and 11 dimensional theories. I could never get my head arou8nd what the other dimensions were supposed to represent. but thats cause i would always lump all the possible realities into one dimension. so i could figure height, width, depth, time, and our place in the multiverse. i never thought to actually seperate realities into their own dimension. basically I thought of dimension 5-10 as being one dimension.