# The visual language of explaining

> Mid-century educational diagrams — arrows, numbered stages, simplified figures — were designed so a child could follow them. Pointed at something that doesn't need explaining, they're very funny.

August 17, 2026 · https://justog.club/stories/educational-filmstrip-illustration

Evaporation, condensation, precipitation, collection. Four numbered stages, four arrows, a
simplified sun and a simplified mountain.

Every adult recognises this diagram instantly, and almost nobody has looked at one since they were
nine.

## Why does it read so strongly?

Because it's the aesthetic of *being taught*, and that's a specific feeling.

Flat mid-century diagram art was designed under real constraints — two or three inks, projected
onto a wall, comprehensible to a child at the back. What came out was a visual language of pure
explanation: arrows for causation, numbers for sequence, figures simplified until only the
function remains.

Seeing it as an adult triggers the classroom before it triggers the content.

## What are the components?

Five, and they're all doing pedagogical work.

- **Numbered stages** — `1.` `2.` `3.` — establishing an order.
- **Arrows**, curved, showing what causes what.
- **Simplified figures**: a sun that's a circle with rays, a person who's five shapes.
- **Two or three flat inks**, usually a warm and a cool.
- **Chunky captions** in a friendly geometric sans.

Nothing is rendered. Everything is a symbol, which is why it survives being printed on anything.

## What's the joke version?

Diagramming something that has no stages.

`THE COFFEE CYCLE`. `THE ARGUMENT CYCLE — 1. EVAPORATION OF PATIENCE`. `HOW A MONDAY FORMS`.
The format's built-in authority does all of the comedy, so the drawing has to stay completely
sincere — arrows correct, numbers in order, captions dry.

That's the same discipline as
[a hazard label](/stories/halloween-costume-shirt) or
[a parts catalogue](/stories/toy-catalogue-page-style): the format is serious and the
subject isn't.

## Is there a straight version?

Yes, and it's quietly lovely.

An accurate diagram of something you actually care about — how a lock works, how bread rises, the
stages of a specific process at your job — drawn in this register is both attractive and useful.
People read it. It starts conversations in a way a slogan doesn't.

For a teacher, a scientist, a technician, that's a genuinely good gift and the format flatters the
subject.

## Can I use a real filmstrip?

The specific plates are the publishers' work, so no.

The visual language is entirely free — it's the shared style of mid-century educational and
government publishing across many countries, produced by hundreds of studios under the same
printing limits.

Which is why it feels anonymous: it *was* anonymous, deliberately.

## Why does it print so well?

Because it's flat symbols with hard edges and few inks — close to the ideal print.

No gradients, no fine detail, a strong overall composition made of separated elements. It reads at
distance because everything is a shape, and it holds together on any garment colour as long as
the two inks have contrast against it.

Same family of properties as
[flat vector](/stories/flat-vector-look-prompts), with a much more specific period voice.

## What size should the captions be?

Bigger than the original.

Real filmstrip captions were sized for projection, which means they're proportionally small on a
printed page. On a chest they need to be readable at conversational distance or they turn into
texture —
[the weave has a floor](/stories/bold-shapes-survive-fabric).

Four captions, large. Not twelve, small.

## How do I get one made?

Describe the process at [JustOG](/) — real or absurd — with the numbered stages. Pick a direction,
drag the crop frame, see it composited on the real garment, and it's made to order and shipped.

Designs other people have published are in the [shop](/shop).

Four arrows and a number. You already know how to read it.