Final answer:
The use of a 'Sosappa' to cover holy mysteries is false; it may be a confusion with the liturgical veil known as the Aer used in Eastern Orthodox traditions.
Step-by-step explanation:
The question regarding the use of a Sosappa to cover the holy mysteries is false. The term 'Sosappa' is not commonly recognized in the context of Christian liturgical artifacts. It is possible that the reference is a misunderstanding or confusion with another term. In the context of Eastern Orthodox and Byzantine Rite traditions, the holy mysteries (the bread and wine used in the Eucharist) are more typically covered with a liturgical veil known as the Aer, which is often elaborately decorated and plays a role in the Divine Liturgy. The icons and mosaics described, such as the Annunciation and the descent of the Holy Spirit, are part of the wider array of religious art that graces the sacred spaces and serves to convey theological themes and enhance the spiritual atmosphere of the divine service.