This is somewhat larger than the wine barrel. The exterior of the building looks like a section of a wine barrel. Previously a wine barrel was constructed for storage. Proanthocyanidins also may be isolated from "Quercus petraea" and "Q. robur" heartwood (wine barrel oaks). Procyanidins can also be isolated from "Quercus petraea" and "Q. robur" heartwood (wine barrel oaks). Stewarts Wine Barrel was sold to United Wine Merchants. A cup of wine is taken from the wine barrel and added to the water. They were drowned in a water-filled wine barrel on Dam Square two months later. The wine barrel was half a wine hogshead or an eighth of a tun. A wine barrel, or 1/8 tun, measures . Therefore, the wine barrel became one of his attributes (beside the abbot's crozier).