如当你沿着铁路线去看两条铁轨，沿着公路线去看两边排列整齐的树木时，两条平行的铁轨或两排树木连线交与很远很远的某一点，这点在透视图中叫做消失点。

艺术家&工程师在纸上表现立体图时，常用一种透视法，这种方法源于人们的视觉经验：大小相同的物体，离你较近的看起来比离你较远的大。凡是平行的直线都消失于无穷远处的同一个点，消失于视平线上的点的直线都是水平直线。

In graphical perspective, a vanishing point is a point in the picture plane that is the intersection of the projections (or drawings) of a set of parallel lines in space on to the picture plane. When the set of parallels is perpendicular to the picture plane, the construction is known as one-point perspective and their vanishing point corresponds to the oculus or eye point from which the image should be viewed for correct perspective geometry. Traditional linear drawings use objects with one to three sets of parallels, defining one to three vanishing points.