In this artwork, how is the abstract discussed?
The Annunciation is a painting by the Italian late medieval painter Ambrogio Lorenzetti, signed and dated  1344, now housed in the Pinacoteca Nazionale of Siena, Italy.
It was painted for the Ufficio della Gabella ("Office of the Tax") of the commune of Siena, as specified by two-line signature at the bottom (the painter named himself Ambruogio Lorenzi).  It was originally located in the Consistory Hall of the Palazzo Pubblico.
Palazzo Pubblico Annunciation Pinacoteca Nazionale Lorenzetti Ambrogio Lorenzetti Siena