The bhavachakra (Sanskrit; Pāli: bhavachakka; Tibetan: srid pa'i 'khor lo) is a symbolic representation of saṃsāra (or cyclic existence). It is found on the outside walls of Tibetan Buddhist temples and monasteries in the Indo-Tibetan region,to help ordinary people understand Buddhist teachings. https://en.wikipedia.org/wiki/Bhavacakra