Many people today surround themselves with crystals, whether for healing properties or as part of their spirituality. But the question of whether crystals can affect the body or the spirit goes back millennia. Marisa Galvez has identified two distinct traditions for understanding crystals. First, there’s a Christian tradition that focuses on how crystals might allow us to transcend the body into a realm of pure spirituality. But there’s also a tradition that links crystals to erotic love. In medieval poetry, the shimmering qualities of crystals are used to capture an experience of love that’s dizzying yet pleasurable.