7. It is a visual element that refers to the illusion of a three-dimensional object on a two-dimensional surface

The visual element that refers to the illusion of a three-dimensional object on a two-dimensional surface is known as "perspective".

Here are the steps to create perspective in a drawing:

1. Draw a horizon line: This is the line at your eye level, where the sky appears to meet the ground.

2. Establish vanishing points: These are the points where all lines converge. In a one-point perspective, there is one vanishing point. In a two-point perspective, there are two.

3. Draw the object: Start by drawing the front of the object (like a building) as a rectangle.

4. Draw lines from the corners of the object to the vanishing point: These lines are known as orthogonal lines. They create the illusion of depth.

5. Draw the back of the object: Draw a line where the object ends. This line should be parallel to the horizon line.

6. Erase the orthogonal lines: Once you've drawn the back of the object, you can erase the orthogonal lines.

7. Add details: Now you can add windows, doors, and other details to your object. Remember to keep these in perspective as well.

8. Shade the object: This will give your object a three-dimensional look. The side of the object that is further from the light source should be darker.

By following these steps, you can create a convincing illusion of a three-dimensional object on a two-dimensional surface.