Imagine an apartment building in the 1920s. A resident finishes their shift at the factory and climbs the dark stairs to the fourth floor. At the top, there is a switch. But the entrance? That switch is at the bottom. To turn on the light before ascending, they had to walk into the pitch-black stairwell, feel for the switch, turn it on, run up the stairs, and then… the light stayed on. All night. All morning. Wasting electricity and burning out bulbs.

You can modify the number of steps, the width of the "giron" (tread depth), and the position of the walking line on the fly, with the software recalculating the entire structure instantly.

At that exact moment, Mr. Moreau is on the 4th floor, carrying a heavy box. The stairwell goes pitch black. He stumbles. He curses. The logic failed him because it didn't know someone new needed the light.

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