Air

Air is the absence of a Block and was one of the first blocks created in Minecraft. Air, though technically not a block, must be treated as such by Map Editors. Air is completely transparent and can only be destroyed or created by the placement or removal of other blocks. Air and other non-solid blocks are the only spaces the player and other Mobs are allowed to move within.

Creative Mode
In Creative Mode Air is simply all the blank space in a map, up to the edges of it. Air cannot be placed, only made by mining other blocks. Since Water and Lava are infinite here, the fluids will create more respectful blocks of the fluid horizontal and below them to symbolize flooding.

Alpha Mode
In Alpha mode, air will restore all bubbles on the Air meter and make it disappear. Entering a block will suffocate whatever is inside, while air will stop the suffocation.

Retired Modes

 * Survival Test - Acts the same as Creative Mode, as well as restoring the Air meter.
 * Indev - Affected Fluid blocks horizontal to it. If Air is touching the fluid block, there is a 2/3 chance the Fluid block will disappear and make the pool recede and a 1/3 chance the fluid block will fill the air, making the pool spread. Restored Air meter.
 * Infdev - Worked the same as in Alpha.

Clouds
There are two types of clouds. 2-dimensional and 3-dimensional. pre-indev have 2-dimensional clouds, while pro-infdev have 3-dimensional clouds, with the ability to turn them into 2-dimensional versions via the "fast/fancy" option. 3D clouds are considerably bigger than 2D width-wise.

Luft