Crucifixion Diptych (van der Weyden) that they could be the left and center panels of a triptych, that they formed either the wings or shutters of an altarpiece, or that they were intended to decorate an organ case. The train of the Virgin's robe continues onto the right panel, which evidences that the panels were intended to lay side-by-side rather than separated (as the wings of an altarpiece would have been). Art historian E. P. Richardson proposed that they were the center panel of the lost Cambrai altarpiece (executed between 1455 and 1459), a single painting now split into two parts. Art historian Penny Howell
Portrait Diptych of Dürer's Parents as a journeyman painter. They were created either as pendants, that is conceived as a pair and intended to hang alongside each other, or diptych wings. However this formation may have been a later conception; Barbara's portrait seems to have been executed some time after her husband's and it is unusual for a husband to be placed to the viewer's right in paired panels. His father's panel is considered the superior work and has been described as one of Dürer's most exact and honest portraits. They are among four paintings or drawings Dürer made of his parents, each of which