Thirty of them at once
Teacher merchandise is apples and pun mugs. A sentence broken into a syntax tree on a blackboard is the actual work — decomposition, in front of a room, for the fourth time today.
A sentence drawn as a tree on a blackboard, branch by branch, with the phrase being parsed reading
THIRTY OF THEM AT ONCE.
It's a grammar lesson and it's a description of the working conditions, and both readings are true.
Why a diagram rather than a slogan?
Because teaching is decomposition, and a diagram is what decomposition looks like.
The job isn't knowing things. It's taking something whole, breaking it into parts a person can hold one at a time, and reassembling it in front of them — repeatedly, for different people, at different speeds.
A syntax tree is literally that operation drawn out. So is a long division, a force diagram, a timeline, a periodic block, a sentence diagram.
What makes the double reading work?
The phrase being parsed is doing two jobs.
THIRTY OF THEM AT ONCE is a valid sentence fragment to demonstrate on, and it's the fact of the
job. Any teacher reading it gets both at the same time, and nobody else notices there was a second
one.
That's the most reliable structure in this whole area: an image that reads as a graphic to strangers and as a memory to the right people.
What's the chalk doing?
Making it a record of a real board.
Chalk texture — slightly smudged, uneven pressure, the ghost of something rubbed out — says a person wrote this by hand, once, quickly. A clean vector version of the same tree is a diagram about teaching; a chalk one is an afternoon.
The smudge is the equivalent of the misregistration on a riso poster: evidence of production conditions.
Does this work outside language teaching?
Every subject has its diagram, and the format transfers exactly.
- Maths — a long division laid out, or a proof's structure.
- Physics — a free-body diagram with the forces labelled.
- Chemistry — a mechanism with curly arrows.
- History — a timeline with one date circled.
- Music — a chord broken into intervals.
- Primary — a phonics breakdown, which is the most affecting of the lot.
The subject-specific version is what makes it a gift for that teacher rather than a teacher-shaped present.
Can I use the school's name?
The school's name and crest are the institution's, and schools do license them.
The classroom is yours, though: a room number, a year group, a subject, or a nickname the
department uses. Those are considerably more specific anyway — ROOM 14 means something to the
people who taught in it and nothing to anyone else.
Same distinction that lets you draw the building but not the crest.
Is this a gift or a self-purchase?
Mostly a gift, and it's a hard category to buy for.
Teacher gifts are famously generic — mugs, wine, apple-themed anything — because the giver usually doesn't know the subject well enough to be specific. A diagram from their actual subject fixes that with one piece of information, which a student or a partner can easily supply.
The end-of-year version, with a year on it, becomes a series worth collecting.
Does chalk print well?
Yes, with the usual caution about the smallest labels.
Chalk on a dark ground is high contrast and hard-edged enough to survive, and the texture is coarse rather than fine. The node labels on a tree are the risk — keep them few and large, and let the structure carry the reading.
Fewer branches than a real board, drawn bigger. It still reads as a lesson.
How do I get one made?
Describe the diagram at JustOG — the subject, and the thing being broken down. 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.
It parses correctly. It's also just true.