Check out this video to learn how to use curvilinear perspective. This shows the idea of how to create a curvilinear perspective image. Normally this view would only be used when drawing something incredibly massive. It's a bit like looking through a fish-eye lens.
This is considered an advanced technique because you should already have a good grasp of 1, 2 and 3 point before trying 5 point or curvilinear perspective.
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