Why did bulls carrying a pyramid appear so often on Anatolian seals from the Assyrian colony period?

In the context of Anatolian religion during the Assyrian colony period, the motif of a bull carrying an enigmatic pyramid on its back is a common feature found on seal impressions.1

This imagery is interpreted by scholars as a symbolic representation of a weather god. The bull was frequently associated with various weather deities in the Anatolian pantheon, and the pyramid—sometimes topped by a bird—served as a distinct iconographic element within this religious system. These seals, which often depict the deity receiving ritual offerings, illustrate the complex religious symbolism that developed among indigenous Anatolian peoples and later matured under the Hittites.12