How to draw a Box (DrTzy)

Preview:
How to draw the perfect Box every time 
KeyWords:
Dimension : A direction within Space
Vanishing Points : The point at which parallel lines meet (Only applies perspective)
Perspective : A Point of View
Convergence : The coming together of parallel lines 
Formula:
2D = Length + Width
3D = Length + Width + Height
How to draw a Box
A Box is a 3D shape
To make a 3D Shape, connect 2 or more 2D Shapes through a 3rd Dimension
For Boxes, just connect 2 squares through height - (height is the 3rd Dimension btw)
Actually Drawing it
Now you know the principles, I'll show you how I execute it
1. Draw a 2D version of your shape
Make sure this 2D-version is front-facing - (It needs to be flat with no tilting)
The purpose of this step is to keep your future proportions consistent
2. Rotate that 2D version with your imagination
At this point, start imagining what the final shape will look like - a rough draft in your mind 
The purpose of this step is to choose the angle and position of your shape
3. Draw perpendicular lines from your 2D shape 
Make sure every set of lines facing the same direction are parallel
Depend on imagination and memory to know what "90°" is supposed to look like
The purpose of this step is to give the 2D shape a 3rd Dimension
4. Draw the last parallel lines
Vanishing Points
"Just connect 2 squares and a box will appear"..
That is not enough!!
You need Vanishing Points too!
When drawing a Box, Parallel Lines should converge into the same Vanishing Point
(This makes it look real)
But 90% of the time, the vanishing point will be off-screen and you'll have to imagine the vanishing point
But don't focus on the Vanishing Point itself
Rather, spend your attention on the [Convergence of Lines] instead
Principles:
Severe convergence = Vanishing Point is close to Subject (From audience's Perspective)
Mild convergence = Vanishing Point is far from Subject (From audience's Perspective)
The parallel line that's closest to you is always a little wider 
The parallel line that's furthest to you is always a closest wider 
Vanishing Point above the shape = You're looking at the bottom of the shape
Vanishing Point below the shape = You're looking at the top of the shape 
(The logic that applies to above and below also apply to left and right)