artdaily

Draw Through

three laps that land on each other

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Going round an ellipse until the laps agree

Each sheet holds one dashed ellipse with a dot at its centre. Press anywhere on it and go round three times in a single go; three pips at the foot of the sheet fill as the laps land, and the loop scores itself the moment the third one does. Lifting costs nothing: press again near where you stopped and the same loop carries on. Four ellipses per round, each a real circle turned further away from you than the last, roughly 31°, 46°, 57° and 64°.

Every beginner is told to go round an ellipse two or three times without stopping, and until this one no drill in the arcade ever checked whether those laps landed on each other. Repeatability is a different skill from accuracy, and the one that decides whether an ellipse looks drawn or fought. So agreement is worth 75 of the 100 here, and the shape itself 25.

How the three laps are compared

Your stroke is unwrapped into an angle around the guide’s centre, so a lap is one full turn and the count can run while you are still drawing. Each lap is then read off at the same 64 fixed directions, which is what makes two laps comparable at all: hurry one and dawdle over the next and the radii still match, so the number describes the curve and never the pace. Agreement is the mean spread of those radii around the laps’ own average, drift is the last lap minus the first — positive for a loop that grows, negative for one that tightens — and fit measures the mean lap against the guide. Agreement runs out at a tolerance eased for the device: 27.3px on a trackpad, 20.5px on a finger, 13.7px on a pen for a desktop-sized loop, scaled only weakly by the guide’s size so a phone’s smaller ellipse is not left with half the room for the same tremor. There is no AI anywhere in that: the laps are compared with each other and with the guide as 64 radii apiece, and the spread between them is the number.

More line & hand drills: Mirror Mirror · Angle Snap · Steady Tunnel · the whole catalogue