Times that walls are useful things:
1) When the big bad wolf comes knocking.
2) In Minecraft.
3) When hanging pictures.
4) When keeping out the barbarian horde.
Times that walls are not so helpful:
1) When you accidentally walk into them.
2) If you’re Humpty-Dumpty.
3) When the critter is INSIDE the wall.
4) When the furniture is an inch too long to fit alongside said wall.
5) When they keep you from embracing the people and opportunities in your life.