In 1964, cognitive scientist Roger Newland Shepard released an article entitled Circularity in judgements of relative pitch, where he described a psychoacoustic effect perceived while hearing a finite sequence of special crafted tones.
Penrose Stairs
Each tone is a chord made up of six notes in six different octaves: their looping sequence (usually between 12 different tones) gives to the hearer the illusion of a tone that continually ascends or descends in pitch, yet which ultimately seems to get no higher or lower.

Similar to Penrose Stairs as the visual illusion counterpart, Shepard's scale has no beginning nor ending points.

02L La Scala Infinita ("The infinite stairway") blazes its own trail towards Shepard's illusion, in a suitable way for museums, scientific fairs and festivals.

12 pads, placed along an inner path of a hovering orbital, gather the pressure of one or more walking visitor. Each pad, when triggered, emits one Shepard's tone. Walking along the shape of the orbital, both clockwise and counter-clockwise, lets the visitor to feel the effect.

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