Final answer:
Poseidon's white horses are not specifically said to bring Aphrodite to any island in Greek mythology. Cycladic Islands were noted for their extensive use of white marble in art and architecture, with the Aegean Sea being the backdrop to many mythological stories.
Step-by-step explanation:
The myth of Poseidon's white horses bringing Aphrodite to an island does not align with the commonly known Greek myths. In most stories, Aphrodite, the goddess of love and beauty, is born from the sea foam and arrives ashore on a shell, with no specific island mentioned in association with Poseidon's horses. However, the reference to white marble in the question may connect to the Cycladic Islands, where white marble was extensively used by the ancient people there. This beautiful natural resource of the Aegean Sea was employed for building structures and creating statues during the Greek Bronze Age. But in terms of mythology, and based on the information provided, there isn't a particular tale that describes Poseidon's horses bringing Aphrodite to an island.
Nonetheless, the Cyclades have a rich mythological history, and they are situated in a geographically strategic position for trade between various ancient civilizations. The white marble of the Cyclades was famous for its purity and was used to create intricate sculptures and structures, which served as a reflection of the rich cultural and religious life that once flourished in the Aegean region.