A prisoner languished lonely inside his cell. Bars, latches, bolts and armed guards closed the exit. The walls were made of reinforced concrete and one meter thick, supported on foundations more than six meters deep; the ground was rammed with firm ground. There was no window, only light entered through a skylight on the ceiling, large enough to pass a person, but two and a half meters high. The prisoner was already looking at her, but he had no furniture to perch.
One day the prisoner saw the possibility. The next morning the jailer found the cell empty.
What plan had the ingenious prisoner devised?
He made a lot of land with which he was on the ground, high enough to reach the skylight.