Is the 4th dimension right under our noses? In the book "Hyperspace" written by Machio Kaku (fantastic book, check it out), Kaku uses what he calls "flatlanders" to depict how, us, 3 dimensional people, could actually be involved in the 4th SPACIAL dimension (4th dimension is not used in the sense of "time" but space in this scenario). Kaku says that 2 dimensional flatlanders like on a line, to these flatlanders, they can only move Up,down,forward and backward, just like humans can only move up,down, forward, backward, and side to side. But Kaku says that a flatlander sciemctists studies this line and realizes that it's actually 3 dimensional. The people of flatland couldn't tell they were on a 3 dimensional shape because the width of the line was just too small to observe, so bringing that into real life... Are we humans those flatlanders? Could the 4th dimension be too small to observe directly? what are your thoughts?