From Catechist Dan Teller:
The priest makes the gesture of epiclesis during the Eucharistic prayer at Mass, by lowering his hands over the chalice and paten, and praying over the gifts, “And so Father, we bring you these gifts…”This gesture is presented to the children as an indication of the first part of an exchange between God and people:  God sending the gift of Himself in the Eucharist; people responding with the gifts of themselves, through the prayer of Offering that the priest makes in elevating the host and precious blood (“Through Him, with Him…)

Uriah (4):  “It's all made of pearls.” (as the glass chalice and paten are brought out, a week or two following a lesson on Jesus' parable, “The Pearl of Great Price”, which indicates the value of the Kingdom of God)