The X, Y, and Z axes

Scientists and engineers typically think of the three axes as:

• A horizontal axis (often called X)
• A vertical axis (often called Y)
• A third axis that is perpendicular to the plane formed by X and Y (often called Z).

However, Alice doesn't deal with X, Y, and Z axes. 

Alice deals with:

• One axis that runs from left to right
• A second axis that runs from bottom to top
• A third axis that runs from front to back

The terms X, Y, and Z almost never appear in the Alice literature.