How Can You Be Made From The Same Cells You Were Born With?!

How do you get bigger from the original cells, if you have the same amount of stuff to work with? Think about this logically. If you take beads, and you divide them into smaller pieces, and try to make something larger out of them, you can't, because if you try to make something that is longer, then you will need to is slimmer. In other words, one aspect can get bigger, but the problem is that you will need to make another aspect smaller. Unless, of course, the cells get bigger over time; how is that possible?! And how about atoms? Could we someday manipulate matter so to make atoms be larger/smaller?!