She drew a row of trees receding into the distance to demonstrate the laws of perspective.

她画了一排由近而远高度递减的树以演示透视图的规律。

youdao

Great view. I like the composition and perspective. Very good colors, light and sharpness. Good contrast between the trees and the earth. Good job!

伟大的景观。我喜欢它的构图和透视。非常棒的颜色，光线和锐利。树木和大地的很好的对比，干得不错！

youdao

For instance, the kiosk explains that Rothermel's deliberate perspective puts the viewer 125 yards from the copse of trees just below Cemetery Ridge in an area of the battle line known as "the Angle, " a jog in the stone wall defended by the Philadelphia Brigade.

WSJ: Capturing Gettysburg | Objects of Valor | State Museum of Pennsylvania | By Mark Yost

You're just so close to it and you sometimes lose perspective, you can't see the forest for the trees, that sort of thing.

ENGADGET: Re-Reading Rainbow: an interview with LeVar Burton