# 08 · Graphic devices

**PRINCIPLE** — Tools, not a template.

**RULE** — Core: the red signal, Light → Bold type, the light sign-off. Optional: info block, chips, spec cells. Specialist: dimension lines, service plans, frames/title blocks. Each must carry information or structure.

**WHEN TO USE** — Chosen per composition mode.

**WHEN NOT TO USE** — Decoration or texture.

**DO**
- Start with no device; add only what the message needs
- One signature per surface

**DON’T**
- Frame + info block + plan + chips together
- Dimension lines without a real value

**EXAMPLE** — See board Graphic devices (07).