The thokcha specimen on the left is directly comparable with the four-tiered shrine in image 16a. Its dates to pre-Buddhist or early Buddhist times. The specimen on the right is clearly that of a stupa. Its large slightly tapering base, squat bumpa and broad pyramidal spire (khorlo) are structural features of Khadampa style stupas built in Tibet from 1000 onwards. The design of this specimen is more in keeping with contemporary conceptions of stupa construction than the Bon variant in image 16b.