ASSIGNMENT SEVEN
Go ahead and try out this technique.
Just like in the example, create a line in the foreground, which is where you will establish your measurements in just a second, but this will also help you establish where the special vanishing point is going to be on the horizon line.
Draw a line from the end of the foreground line, intersect it at the bottom right hand corner of your plane, and bring that all the way back to the horizon line. This tells you where your special vanishing point is going to be.
Here I used the ruler tool to add in the correct measurements along the foreground line.
From here all you have to do is connect the Special Vanishing Point with our measurements to divide our plane evenly.
Draw in your vertical lines to finish off this exercise.