Where would you find such stone artefacts? What is their purpose?





The Micronesian island of Yap uses large circular stone disks called Rai as a currency. The larger the disk, the higher its value.

Cracked by Anon-not-on-Narcotics, Arjun and Namrata. Also, one large Rai to Namrata for reminding me that I hadn't put the answer up.