Crossing Guard Treasure Sort

A sitting-down sorting game that makes one hand travel right across the body to the “other side of the road.”

  1. Sit the child cross-legged on the floor (or on a chair at a table) and tell them their bottom is “glued down” — only the arms may travel.
  2. Put a pile of small treasures (pom-poms, bottle caps, blocks, socks) on the floor beside their left hip and an empty bowl beside their right hip.
  3. The right hand is today’s crossing guard: it reaches across the tummy to pick up one treasure, carries it back over the “road” (the middle of the body), and drops it in the bowl. The left hand rests on the left knee.
  4. When the pile is gone, swap everything round so the left hand crosses to the right side.
  5. Finish with a two-colour sort: treasures in the middle, red ones go in the bowl on the far side of the reaching hand, blue ones on the near side.

Variation: stand at a window or large mirror with feet on two paper “footprints” and wipe one huge rainbow arc from side to side with a cloth in one hand — the other hand stays on the hip and the feet do not move.

Requirements

  • Space: About 1.5 meters of clear floor or a tabletop
  • Surface: Floor, rug, or table
  • Materials: 10–20 small objects and two bowls or boxes; a cloth for the window variation
  • Participants: 1 child and 1 adult to set up and cheer
  • Supervision: Light — closer if the objects are small and younger siblings are around

Rationale & Objective

Crossing the midline — reaching a hand into the space on the opposite side of the body — is one of the two skills named in this subdomain’s description, and “crosses midline spontaneously during reaching tasks (no trunk rotation)” is one of its measurements. Research in the American Journal of Occupational Therapy found a clear developmental age trend in midline crossing across the preschool years (Cermak, Quintero & Cohen, 1980; Stilwell, 1987): younger children tend to pick up objects with whichever hand is nearest, and crossing becomes more frequent with age. Children who rarely cross often switch hands at the middle of a page or twist the whole trunk instead. Ayres described reluctance to cross the midline as one sign of immature bilateral integration. Giving the reaching hand a clear job and keeping the trunk still provides gentle, repeated practice of the pattern needed to draw a line across a page, read along a row, and dress without swapping hands.

Progress Indicators

  • Early: swaps the object to the other hand at the middle; twists the whole trunk or shuffles round to face the pile; needs the resting hand held on the knee
  • Developing: crosses with the preferred hand when reminded; some leaning and trunk turning; the non-preferred hand crosses with more effort
  • Proficient: either hand reaches fully across with shoulders mostly facing forward; keeps going through a whole pile without hand swapping
  • Advanced: crosses the midline spontaneously in everyday tasks (wiping a table, reaching for a far crayon, drawing a long line); can sort by colour to both sides while keeping the trunk steady

Safety Notes

  • Choose objects too large to swallow if younger siblings are playing nearby
  • Cross-legged sitting is uncomfortable for some children — a low stool, kneeling, or a chair at a table works just as well
  • Never hold a child’s arm down to force crossing; give the spare hand a job (holding the bowl, resting on the knee) instead
  • Do not use this game to push a hand preference — let the child choose their lead hand in daily life
  • If a 5-year-old almost never crosses the midline, has no emerging hand preference, or seems to ignore one side of the body, discuss it with a pediatrician or occupational therapist

Hints

  • Playfulness: the reaching hand wears a sock puppet “crossing guard” or a sticker badge; treasures are passengers who need help over the road
  • Sustain interest: change the cargo and the story — feeding a hungry monster box, loading a toy truck, posting letters through a slot in a shoebox
  • Common mistake: placing objects only slightly off-centre. Put the pile well out to the side, level with the hip, so a true reach across the body is needed
  • Limited space: play at the dinner table — cutlery pile on one side, tray on the other — or do the window-rainbow variation, which needs no floor space
  • Cross-domain: count each crossing aloud (numeracy); name left and right as the hand travels (spatial language); sort by colour, size, or first sound
  • Progression: preferred hand crossing in sitting → non-preferred hand → two-colour sort to both sides → tall kneeling (more core work) → standing window rainbows → drawing big sideways figure-eights on paper taped to a wall

Sources

  • Stilwell, J.M. (1987), “The development of manual midline crossing in 2- to 6-year-old children,” American Journal of Occupational Therapy, 41(12), 783–789
  • Cermak, S.A., Quintero, E.J. & Cohen, P.M. (1980), “Developmental age trends in crossing the body midline in normal children,” American Journal of Occupational Therapy, 34
  • Ayres, A.J. — Sensory Integration and the Child (bilateral integration and avoidance of midline crossing)
  • OT Practice Framework (OTPF-4), AOTA 2020 — motor performance skills “reaches” and “coordinates”
  • Case-Smith, J. & O’Brien, J.C. — Occupational Therapy for Children and Adolescents (development of bilateral hand use)