Crucifixion Diptych (van der Weyden) and theorized that the diptych represented two panels of a four-panel work – either the two-panelled left shutter of an altarpiece, or its center two panels. Based on pictorial style, Tucker argued that the large size of the human figures relative to the size of the panels was more in keeping with figures on the shutters of "carved" altarpieces than painted ones. He also noted that the shutters of carved altarpieces tend to de-emphasize the deep perspective commonly seen in painted altarpieces, which was consistent with the shallow pictorial space of the diptych. The diptych's figures are almost two-thirds life
Early Netherlandish painting both sides or with the reverse bearing family emblems, crests or ancillary outline sketches. In the case of single panels, the markings on the reverse are often wholly unrelated to the obverse and may be later additions, or as Campbell speculates, "done for the artist's amusement". Painting each side of a panel was practical since it prevented the wood from warping. Usually the frames of hinged works were constructed before the individual panels were worked on. Glue binder was often used as an inexpensive alternative to oil. Many works using this medium were produced but few survive today because of