Classroom, rows of desks

What to look at

Repeated equal objects are the clearest lesson in diminution: each row of desks is smaller and closer together than the last.

Both figures' eyes are on the horizon because they stand on the same floor as the camera; the shorter one's head sits a little lower.

The desk tops (0.75 m) are all below eye level, so every one shows its top surface.

What this scene is for

Nine identical desks in three rows are the cleanest test of whether you can repeat an object into depth. Use it for classrooms, offices, waiting rooms, canteens, theatre seating and any grid of equal furniture — and use the two figures to check that your desks are the right height against a person.

The mistake it settles

Making each row smaller but keeping the rows evenly spaced, which reads as a staircase rather than a floor. Both the size and the gap must shrink together. The floor squares under the desks do that arithmetic for you.

The camera

Measured off this render

Taken from the same camera model the tool draws with, on the 1340 × 754 PNG above.

Draw it from these numbers

1. Rule the horizon across the sheet at 60% of the picture height — 452 px down on this 754 px render. Every other line in the scene is measured from it.
2. Two vanishing points on that line: 309 px from the left edge, and 1,541 px beyond the right edge — far enough out that you should match the grid angles instead of chasing it.
3. Set the scale from the 1.75 m figure at 7 m: 241 px tall, with 91% of it below the horizon. That share is the camera height divided by the object's height (1.6 ÷ 1.75 m), and it is the same for every object of that height anywhere in the picture.

Open the reference in the tool to move the camera, change the lens, or add your own objects at real sizes; the share link keeps your version. Draw over the PNG at 30–50% opacity in any app with layers.