One starts with the horse's head, and the other starts with, well, the other end of the horse. When their brushstrokes meet at the midpoint of their shared canvas, the Anderson sisters, Elizabeth Mary (above, left) and Dorothy Margaret, have a finished product. They are twins, often dressing alike, and have painted like this for 50 of their 70 years. For 30 of those, while Dorothy Margaret's marriage kept the duo from painting side by side regularly, they kept in practice by mailing one another semicompleted works for the other to finish. Now reunited, they've built a thriving business in their native Yorkshire, England, painting horses (like their own Blossom, left, held by their brother Tom) and other farm scenes and selling the pictures for a handsome $50 to $90 each. "Sometimes we wish we'd gone to art school," says Elizabeth Mary, "but our friends think that would have spoiled us."