Use MATERIALS. Offer four fixed messages: A WAVE → SHOW STAR → FINISH, D WAVE → SHOW MOON → FINISH, short SHOW STAR → FINISH, or repeat WAVE → WAVE → FINISH. Offer Key 1 or Key 2; both add OVAL=SHOW MOON for this extension. Read key and message exactly. Key 1 circle=WAVE/square=STAR/triangle=FINISH; Key 2 square=WAVE/triangle=STAR/circle=FINISH.
- Child chooses one fixed source and key, then object, picture-word or symbol display. Use broad real props for object form; the screen only shows descriptions/pictures/symbols.
- Adult places/draws/reads only on the child's exact directions. Under Key 2, D is square → oval → circle. The meaning/order stays WAVE → SHOW MOON → FINISH.
- A reader uses the displayed matching key; compare their actual interpretation with the source. The studio does not judge an assessment answer or expose a fresh check source.
- Clear/reset returns to A, Key 1 and picture-word view; paper can be reset in the same way. No name, voice, image or other personal value is required. A child may rest/pass.
No digital-system use follows from paper. Complete text descriptions are a valid data decision route; record whether the physical object form was actually made and who handled it. This activity is not a puppet-performance or repeating-pattern Mathematics assessment.