Article by Marian Hague describing an exhibit at the Cooper Union Museum that placed needle-made and bobbin-made laces of similar pattern side by side to show how technique affects design. It traces European lace design from the 16th to the 18th century: Italian reticello and scrolling bands, French candelabre patterns, wide Point de Sedan, Mechlin and Brussels flounces, and lace imitated in silk brocade, embroidery and pricked muslin. Nineteen numbered plates of museum and private-collection specimens carry detailed captions with dates, attributions and dimensions.