 There are several theories about its function.It has been proposed that, following the processional path, the capillas posas served to “pose” or rest the Blessed Sacrament when it was taken out in procession through the atrium.Researcher Carlos Chanfón has suggested a didactic function to house groups of students who were catechized, since one function of the atrium in these sets was the teaching not only of religion but of the norms and offices of Western life.