Leave space for movement — Design, 4–6 years
A moving part needs room around it, not just a place to fit. Design, 4–6 years.
Room to move
Some parts of a design move: a door swings, a drawer slides and a wheel turns. These parts need clear space, or they bump into something and stop. A good design leaves room for the movement.
Why is space needed?
A part may fit when it is still but fail when it moves. Designers noticed that doors, lids and wheels need a little extra room to open or turn. Leaving this space solves the problem of parts scraping, trapping fingers or getting stuck.
A drawer that opens
A toy drawer is 20 cm wide, but the box around it is also exactly 20 cm wide. First, try to pull it out: its sides rub, so it sticks. Next, make the drawer 19 cm wide. The 1 cm of spare room lets it slide in and out.
It fits, so it must work
It is easy to check only whether a part fits in its place. That seems sensible because we often look at objects while they are still. But a moving part needs space for its whole path, not just its resting position.
Where do we see it?
You can see this in cupboard doors, pencil cases, toy cars and scissors. A cupboard door needs room to swing, and scissors need room for their handles to move. Designers use the same idea for lifts, gates and moving playground parts.
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