I was reading the recent chapter something hit me. Kaguya may have exactly 10 dimensions. The core one is the one that links the other 9.As we have seen Sasuke was in the desert dimension(Shukaku the 1 tail).There was a lava dimension (Son Goku the 4 tails).The sea of acid (Saiken the 6 tailed beast), perhaps the ice dimension is the place linked to Isopu the 3 tails. What do you think ?