stackyFACTSDrawing staircases for hours relies on cleverly scraping a window. The inside of this classic toy is coated in a sticky metallic powder, and spinning the knobs moves a hidden stylus on a mechanical pulley system that simply scratches the powder off the glass from the inside.
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The most frustrating drawing apparatus ever constructed is basically an industrial hazard securely trapped behind glass. The stylus physically scrapes an…
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