The shelves in Iva Pfeiffer’s sewing room are stacked with neatly folded fabric samples, bundles of wool, and possibly every craft book ever written. There are books on bobbin lace, on embroidery, on weaving fabric from silk. Lately, she has been experimenting with natural dye. She shows me a hank of sheep’s wool, which she hopes to turn into fabric – just as soon as she can figure out what makes blue dye. Blueberries, she says, are notoriously unreliable.