::One Point Perspective:: One point perspective is one of the easiest perspective drawing styles available. The reason for this is that all lines lead to a single point, and regardless of how complex your object is, it's easy to realize when you've made a mistake, and just as easy to correct it.

What is One Point Perspective? Dictionary.com define one point perspective as: ...a mathematical system for representing three-dimensional objects and space on a two-dimensional surface by means of intersecting lines that are drawn vertically and horizontally and that radiate from one point on a horizon line... Although this definition sounds complicated, the concept is relatively simple. One point perspective is a drawing method that shows how things appear to get smaller as they get further away, converging towards a single ‘vanishing point’ on the horizon line. It is a way of drawing objects upon a flat piece of paper (or other drawing surface) so that they look three-dimensional and realistic

Key Terms to Know The horizon line is the eye level of the viewer.  This line sets up the orientation of the scene and gives the viewer some bearing as to how the visually relate to the image. 

Key Terms to Know The vanishing point is on the horizon line where perceptually all things converge.  In one point perspective, the objects appear to diminish they follow a path back from the front of the scene to a single point.    

Key Terms to Know The orthogonal lines, are the lines that move from the object to the vanishing point.  The purpose of these lines is to set up the visual path to the vanishing point, directing the shape of the object in perspective. 

Two Important Rules: Before we jump in, there are some important rules to keep in mind when drawing in one point perspective. All vertical construction lines are parallel to one another; All horizontal construction lines are parallel to

Choosing Your Vanishing Point Keep in mind that the position of your vanishing point is critical. The further away you move from the center of the canvas, the more biased your perspective will be to one side of the object. Basically, your image is affected similarly to how your object's position, in relation to the horizon line, affects if you see the bottom or top side. If you go very far to your left side, and your object is located on the same side, you risk only being able to view two sides of your object instead of three.

Less Than Ideal Placement of the Vanishing Point As you can see, choosing a vanishing point on the same side as your object limits the sides you're able to render. Imagine if you'd have decided to also lift the box by a few centimeters! That would basically leave you seeing a single face and no possible hint towards the volume of your object. 

Good Placement of the Vanishing Point In contrast, the image above displays a more appropriate vanishing point placement.

Can you find the vanishing point, orthogonal lines, and eye level in this artwork? 'Bedroom in Arles' by Vincent van Gogh

TA＼( ˚ ▽ ˚ ) /DA 'Bedroom in Arles' by Vincent van Gogh