School boy observing detention. He sits in a chair at a small individual desk. He concentrates whilst drawing a line on a piece of paper with a pencil aided by a ruler. On the table is an eraser, a compass, a protractor and a square. The boy wears a jacket, shorts, boots, and socks. Underneath his chair is a model aeroplane and in his jacket pocket a catapult. In the background is a blackboard with mathematical statements and diagrams. Image is bordered by two roughly drawn overlapping lines in black and ochre. Chalk style lithograph. Text on image, on blackboard, 'Detentions Jones Smith', 'QUESTION 1 CONSTRUST A [triangle] ROUND THE [circle] THEN WITHIN THE [cicle]', 'STRAGHT LINE AT ANY ANGLE', 'LET AB BE DIAMETER OF [circle] BISECT AB AND AT THE INTERSECTION POINTS BELOW AND ABOVE' and 'TRISECT'