20 The Annunciation retable there once was a groove-and-tenon system in place for fixing the pillars onto the predella. Those tenons are lost. There are no signs of classic carpenters’ wood joints. Wooden beams, boards and mouldings are only connected by iron hand-forged nails. Even the carved ornamental applications are fixed with nails to the flat surfaces of the construction. Glue has only been used for small elements such as the rosette. This additive way of construction is very effective and fast (Fig. 19, 20). Fig. 19: Detail of the entablatura, compare Fig. 20 Fig. 20: The view of the end section of the entablatura exemplifies the additive building manner
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