One-point perspective uses a single vanishing point on the horizon line to make any surface receding directly away from the viewer — like a hallway, road, or train track — converge convincingly into deep space.
It's the fastest way to make a flat drawing read as a real 3D space, and it's the foundation every other perspective system builds on.
A single horizontal line across your page at your eye level.
Mark one point anywhere on the horizon line — everything receding into the distance will point toward it.
Draw the front-facing surface of your object (a box, doorway, or building face) as a flat, undistorted rectangle.
Lightly connect each corner of that front face to the vanishing point — these guide lines show how the object recedes.
Draw the back edges of the form parallel to the front face, stopping wherever feels right along the orthogonal lines.
Erase the orthogonals you don’t need and darken the final edges.
Draw a simple hallway or a road lined with telephone poles — the poles get shorter and closer together as they approach the vanishing point.