21 The Annunciation retable Boards with “puzzling holes” The main construction boards show traces of a mill driven saw, rough but perfectly equilateral and squared to the length of the boards, probably indicating the use of wet wood 22 (Fig. 21). Most of these boards have a thickness of about 20 mm. Characteristic holes with a diameter of about 30 mm are visible in various boards of the construction, having no function or obvious reason within the construction (Fig. 22, 23, 31, 32, 49). Fig. 21: Marks of mechanical sawing Fig. 22: Strainer of the Annunciation painting, detail Fig. 23: Left side of the retable, hole with no function but closed with a dowel
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