This article is about making an inventory of different types of apples, and they hired an artist to make porcelain apples for reference. She talks about the difficulties of making the apples to scale and testing out all the glazes to get the correct colors. They look really simple and realistic, but they all took so much work to get them perfect. It's a cool combination of biology, food and art. http://www.theatlantic.com/health/archive/2013/02/our-comprehensive-living-archive-of-apples/273538/