Hypersmurf said:Three inches by five feet is larger than one square foot (1.25), so the gap at the bottom would make the Wall not-a-barrier for LoE purposes, but it will prevent the PCs walking out.
-Hyp.
I have to disagree with this one. I think the gap must be 1 foot PER side. Otherwise it just gets silly. A 1 inch by 144 inch gap would qualify by your reasoning. Or you can go even thinner.