Ergonomic Codex Design

Here we are in the year of our Lord 3824 (I didn't check) and we're still using rectangular books. Shouldn't they at least have a handle even if we won't go so far as to have a curved design so that there's room at the upper left to be grabbed while there's space where your heel will be? Also, is there another term for the part of your hand continuing from your thumb that makes a valley of your palm? I looked around a little bit but didn't find one.