The rather obscure public recognition of the roles of these five "morphs" in ancient stone art make it unlikely someone would intentionally manufacture such a stone in current times. It seems very likely only someone with great exposure to stone material offered by a hunter-forager's intimate relationship with and knowledge of lithic resources, as well as a great culturally-driven desire to express these five creatures simultaneously, could produce the final form seen here. It is a combination of iconography and a craftsmanship of another time.
The most obvious human activity documented besides the saw cut is drilling and expanding of the lion’s mouth to manufacture a look of “snarl” or “grrrrrrr” out of the side of the mouth. There is a definite area of focused multiple percussive blows on the forehead of the ape, just above the right eye. The ape's mouth line seems partially incised. The ape's eye area was excavated down to black stone and recessed under a natural stone inclusion serving as a hard brow line. White stone was removed to access black stone underneath to make the two eyes of the elephant. The primate face mask has two ground stone nostrils. The duck likewise has white stone removed to depict an eye in exact location.
The piece appears polished, maybe resulting from a combination of environmental rolling, intentional polishing of breaks made to enhance the final form and smoothing and patination from human handling of the stone.