RPGMaker MV Tutorial: "3D Walls & a little hype about Yanfly's Event Copier"

Since i'm making a RPGMaker MV game...i figure: "Why not share what I know and do in my own game?"
So I'm doing that with the FIRST trick i learned to do when messing around with VXAce years ago, which also works in MV, the "3D Walls"

What are 3D Walls? -- It's a trick to give DEPTH to your otherwise 2D RPG World. By learning this simple trick using the EVENTS, you can make WALLS YOU CAN WALK BEHIND to give a sense of 3D/Depth to any map.

This trick ALSO segways into a couple other neat tricks like "Secret Passages" and making "Bridges",..maybe even more if you put your imagination to it? :D

Hopefully this is helpful to any RPGMaker user who wants to make their maps less "flat" and more "deep".