Trees on the way back from Ravel’s house as night fell; one of Caspar David Friedrich’s moons above the tracery of winter branches; an early pattern book – tracery in print; Antwerp Lace – highlights on black cloth – delicate, graphic beauty. Women working, a woman working, painstaking work: for the finest lace 10 hours, perhaps, for a 3cm square – almost to scale then, in a magic lantern slide, carefully labelled.