The internet: where one thing leads to another

I loved this photo by ceramics artist Paul Scott:

To judge from the tags, it shows sprig moulds in the Spode archive. But what are sprig moulds? Ah, here's a video in which a potter shows how he molds sprigs to decorate Wedgewood Jasperware - I'd embed it, but LJ seems not to want to do that this evening... - the sprigs being the white decorations on the coloured body of the vase or dish or whatever it's going to be (whose colour comes from minerals added to the clay. The little sprigs are lined up on a slab of clay which is "cheese hard" - much firmer but still with some residual moisture. So that's another technical term...