Wall

Cobblestone wall is a block designed for decorative purposes such as gardens and are 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. Cobblestone walls are more efficient at fencing off mobs than a two-block high cobblestone wall, costing only half as many blocks, and being more space-efficient as well. The drawback, however; is that a skeleton might shoot over the wall, a creeper could explode if a player is standing near the wall or a spider may climb over the wall.

Trivia

 * Interestingly, mossy cobblestone wall's 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 (of either type) it will stoop down slightly to match the height of the cobblestone wall.
 * If the fence gate is only placed next to only 1 (mossy) cobblestone wall, or vice versa, it will not lower.
 * Although the cobblestone wall only raises at corners and ends, it will raise to support a solid or non-solid block placed above it.
 * Cobblestone walls function the same way as fences, yet are placed in the building blocks tab of the Creative inventory instead of the decoration tab.
 * Mob heads are the same size in width as the posts on a cobblestone wall.
 * You can connect both types of cobblestone walls together but not both types of fences.
 * Unlike fences, if two cobblestone walls are placed one block apart diagonally, you cannot walk between them.
 * Unlike the Fence and the Nether Brick Fence, which do not connect when put beside each other, the Cobblestone and Moss Stone walls connect when put beside each other.

Gallery
Pflastersteinmauer Muret Murek z bruku Булыжниковая стена 圆石墙