What detail of the Mérode Altarpiece (Fig. 19-10) indicates that the scene of the Annunciation is a religious vision of the donors'?

Question

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The opened door in the Mérode Altarpiece suggests that the scene of the Annunciation is a religious vision of the donors, as it symbolizes the entry of the divine into the earthly realm, connecting the sacred event with the donors' world.

What Detail of the Mérode Altarpiece (Fig