What detail of the Mérode Altarpiece indicates that the scene of the Annunciation is a religious vision of the donors?

Name: What detail of the Mérode Altarpiece indicates that the scene of the Annunciation is a religious vision of the donors?
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The opened door to the other room suggests that the scene is a vision, as it connects the donors' space with the sacred event, indicating that they are witnessing the Annunciation as a spiritual experience.

What Detail of the Mérode Altarpiece Indicates That the Scene