For the next fifty boxes of the challenge, there will be two main changes from the last set:
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We will no longer be marking our vanishing points on the page
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Instead of dramatic foreshortening, we'll specifically be trying to draw our boxes with slower convergences/shallower foreshortening.
Having the vanishing points drawn directly on the page gave us something to aim at, so we'd be focusing on the corner we were drawing from and that VP. Since we don't have that anymore, we instead have to focus on how the line we're drawing converges with the other 3 lines belonging to its set, both those that have been drawn, and those that haven't.
Instead of being able to focus on the vanishing point, we are now forced to pay attention to what that vanishing point represents. While this is quite a bit more difficult, it is also considerably more useful, because it allows us to focus more on the information that is present right on the page, where we're drawing, instead of trying to manage a bunch of far-off vanishing points.
Keep in mind that while we are drawing boxes with shallower foreshortening, that does not mean we are forcing any vanishing points to infinity or drawing our edges as though they are parallel on the page. Remember - there is no such thing as "0 point perspective", as explained here in Lesson 1.
Aside from these two key points, the rest remains the same. We're still drawing 5-6 boxes per page, using the ghosting method for all of our linework, and still applying the line extensions to check our convergences.