Horizontal, Vertical, and Oblique

What does horizontal, vertical, and oblique mean?

If an object is horizontal, it is parallel (level) to the ground and the horizon. A snake is horizontal when it slithers on the ground. Humans are horizontal when they are sleeping or lying on the ground.

If an object is vertical, it is up and down. A tree is vertical. Humans are vertical when they are standing up.

If an object is oblique, it is at an angle. It is not horizontal and it is not vertical.

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