Square frame of four crossed rods, a circle at each crossing
Four rods laid to form a square, each intersection marked by a wheel-like circle
Four rods are laid so that their crossings enclose a square, and each crossing point is marked by a circle; several of the circles are quartered by cross-lines like small wheels on axles. The figure is drawn faintly in reddish chalk, the rods and rings set near the four corners of the square. Its purpose is not spelled out on the sheet.
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Four crossed rods with circular joints
The layout is a square formed by the crossings of four rods, with a circle set at every crossing. Some of the circles are divided by cross-lines through a central hub, suggesting wheels or pivots placed at the corners of the frame.