Wall

Cobblestone Wall is a block introduced in snapshot 12w34 designed for decorative purposes and an alternative to fences. There are 2 types: Cobblestone Walls and Mossy Cobblestone Walls. They work very similarly to fences, as they are 1.5 blocks tall to mobs.

Trivia
to match the height of the cobble wall.
 * Interestingly, Mossy Cobblestone Walls name is based on the old name for Moss Stone and not the new one.
 * when a fence gate is placed between 2 cobblestone walls (either type) it will stoop down slightly