On 16 September 2005, Sweet Dreams — or Sogni d’oro — was launched on the web. At the time, it was considered the first paper automaton to use a Geneva stop, also known as a Geneva drive: a compact mechanism that turns continuous rotation into precise intermittent motion.
The model is small and quiet, but its mechanism gives it a distinctive rhythm. Instead of producing a smooth, continuous motion, the Geneva stop advances the driven wheel step by step, with short pauses between one position and the next. This is the same mechanical principle historically used in watches and in film projectors, where a strip of film must stop briefly in front of the lens before advancing to the following frame.
The title carries a small bedtime joke. In the familiar advice given to those who cannot fall asleep, one is supposed to count sheep as they jump over a fence. Sweet Dreams takes that old suggestion quite literally and turns it into a paper mechanism.
Technical data
- Mechanism: Geneva stop / Geneva drive
- Number of parts: 40
- Size: 120 × 85 × 210 mm
- Paper: 160 gsm card stock
- Instructions: English and Italian, colour illustrated
In a Geneva stop, a pin on the driving wheel enters one slot of the driven wheel and pushes it forward by one step. Between these active phases, the driven wheel is locked in place. For a paper automaton, this is especially attractive: the mechanism makes the movement legible, mechanical, almost theatrical. The pause is not a defect; it is part of the expression of the model.
Note: the graphic design of the model was developed in collaboration with Francesco Grazioli.
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