Locked up.

The Enclosure of Nuns.
The above photo is a Visitation Monastery speakroom from the 1960’s. Since the Second Vatican Council, several monasteries have taken down their enclosure grilles, while not a few have ceased to observe strict enclosure or wear traditional habits. Although there remain many monasteries that continue to do so; one of these is the Discalced Carmelite Monastery of Our Lady of Divine Providence, at Lake Elmo, Minnesota.
Since the Council, many of the cloistered orders that retain grilles, have modified them somewhat, while they remain more a decorative symbol of cloister, than a “protecting” fortification. The Council of Trent had imposed severe reforms concerning woman religious, requiring strict norms of enclosure. Grilles within most monasteries had to be double, and the openings small enough to prevent a woman’s hand extending through. In addition, the nun had to be accompanied by another nun when meeting outsiders, except in confession, and she had to wear an enclosure veil covering her face, unless the grille itself was curtained.
Feminists like to cite the regulations imposed by the Council of Trent as an example of the patriarchal supression of women, although grilles and walls of separation have always been intended to foster the contemplative life. (It should be noted that at the time, woman were considered the weaker sex, not only requiring protection from outsiders, but, as others have suggested, to prevent them from exercising their seductive, feminine wiles over men.) Nevertheless, these barriers were decidedly practical fortifications for the protection and safety of the nuns. Interestingly enough, the decrees and strictures of Tridentine Papal Enclosure eventually led to the formation of more “active” religious orders of women, known as semi-cloistered “sisters” - not “nuns” in the strict monastic sense.
Anyway - that’s about all I know about monastic grilles and veils. If you have ever lived in a cloistered monastery, it is not at all as mysterious or exotic as it appears to outsiders.
For those desiring a deeper understanding of the true meaning of cloistered life, you may want to read Verbi Sponsa, the Apostolic Instruction on the Contemplative Life and the Enclosure of Nuns.
