Witches' Sabbath (The Great He-Goat) powdered glass, orpiment and iron oxides. He likely worked with mixed materials. Technical analysis indicates that most of the Black Paintings begun with preparatory drawings. "Witches' Sabbath" is the exception; the final composition seems to have been painted directly onto the wall. Art historian Fred Licht notes that Goya's brushwork appears "clumsy, ponderous, and rough" and lacking finish compared to his earlier work. Licht believes this was a deliberate ploy to physically convey dismay at human inadequacy and his own feelings of personal doubt. Unique in the series, "Witches' Sabbath" was not significantly altered by Goya after his initial work.
Parasol Unit Foundation for Contemporary Art the disposal of the foundation at no charge. Every year the foundation organises four challenging and thought-provoking exhibitions of works by international contemporary artists working in various media. Parasol Unit has introduced a host of international artists to London’s public and has been instrumental in launching the careers of artists such as Michaël Borremans, Yang Fudong and Charles Avery. Entry to exhibitions at Parasol Unit is free. In 2009, the foundation launched its Exposure Award, an annual programme which gives recent graduates the opportunity to exhibit their work alongside a major exhibition at the gallery. Each year Parasol Unit selects