Proximity in interactive art without a complex sensor

Distance can invite or withhold

A proximity artwork changes as someone approaches. That simple description hides an important choice: does distance continuously alter the work, or does crossing a boundary trigger an event? Prototype those alternatives before investing in a particular sensor. Their expressive possibilities differ even in a manual demonstration.

Mark near and far states on the floor

Mark three distances from a tabletop object. Have a collaborator change a paper image as the participant crosses each mark. For a solo test, move a small token across a drawn plan and operate the response yourself. Keep the near and far states visibly distinct.

The useful adjustable quantity in this study is near-state threshold; give it a name and a clearly recorded starting value. Create a plain reference version before adding expressive variation. Preserve that reference while revising, because memory is poor at comparing subtle differences across separate sessions. Compare the versions in the same viewing conditions. A useful acceptance check is whether the state changes feel stable at the boundary. Judge that at the intended viewing size or working distance, where tiny construction mistakes and exaggerated effects can have very different consequences.

Stabilize behavior around the boundary

If the work flickers around a boundary, use different thresholds for entering and leaving the state. A participant hovering near one distance should not cause frantic switching. If approach direction matters, include it explicitly rather than assuming distance alone describes the encounter.

Use the plain reference to decide whether near-state threshold caused the problem or merely made it easier to notice. Try an ordinary action, an incomplete action, and two actions in quick succession. Watch whether the piece acknowledges each input and returns to a usable state afterward.

Compare gradual opening with a threshold reveal

Compare an object that opens gradually as someone approaches with one that reveals a hidden interior only after crossing a threshold. Ask whether the experience feels welcoming, secretive, or demanding. Those readings come from behavior, not the sensor's prestige.

Build a comparison around these settings: close reach, ordinary arm's reach, and a larger approach zone. Use the first trial as an anchor, the second as a moderate departure, and the third to reveal the limit of the idea. Return to the anchor before deciding. The final choice may sit between the tested values; use the comparison to identify that smaller next adjustment.

Use a small gap between entering and leaving

For the shy flower, imagine it closes when the visitor comes within one marked distance but does not reopen until they move clearly farther away. This gap stabilizes the behavior around the boundary. Demonstrate the rule manually with two floor marks before coding it. If the gap feels unresponsive, narrow it. If the flower chatters between states, widen it while preserving a clear relationship between giving space and seeing it open.