In this video, Vladimir London, a Life Drawing Academy tutor ([ Ссылка ]) will show you how to draw horizontal squares in perspective. Let's begin with a one-point perspective. Here's the horizon line. The vertical line crosses the horizon in the vanishing point. This is the point where two vanishing lines converge to. A square in one-point perspective follows those vanishing lines. The distance to the horizon is elevation. So the depth of a square depends on how high the point of view is. I will mark that depth as "A" here. The line "B" is the only undistorted side in this drawing. You can note that the frontal outline of a square is bolder than the rear one.
Now, let's make another drawing of a square in two-point perspective. Instead of one vanishing point we will use two points. Here's the square that is seen from above in two-point perspective. Once again, the distance to the horizon is elevation. The depth is marked again as "A". The frontal outline of this square is bolder because it is closer to a viewer and the rear outline is slimmer. Two vanishing lines are pointing to the left. They will converge into one vanishing point that is on the horizon. The second vanishing point is also located on the horizon level.
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