The Technical Process: How A Skull Becomes A Face
The translation of the Punín-2 skull into a facial reconstruction involved multiple technical approaches applied in sequence, combining digital work with partial physical reconstruction using wax, and drawing on established libraries of data about tissue thickness.
The starting point is the skull itself, which provides the hard structural data — the geometry of the bone that underlies the face. The skull tells you the width of the eye sockets, the projection of the nasal bones, the angle and dimensions of the mandible (lower jaw), the height and width of the cranium, and dozens of other measurements that collectively constrain the space within which the soft tissue of the face exists.
These measurements are objective data. They don’t require interpretation in the way that subsequent steps do. The eye sockets of the Punín-2 skull are the dimensions they are; the nasal bones project the distance they project; the mandible angles at the angle it angles. These are facts about the bone.
The next step is the application of tissue depth data — information about how thick the soft tissue is at specific landmark points on the face, derived from studies of living people. This data exists in libraries that have been accumulated across decades of research, in which the depth of skin, fat, and muscle at specific points on the skull was measured using medical imaging or physical methods in people of known demographic characteristics.
For the Punín-2 skull, the appropriate tissue depth data would be drawn from studies of populations most similar to the individual being reconstructed — in this case, Indigenous American populations. The average depths at each landmark point provide guidance for the reconstruction while acknowledging that individual variation exists around those averages.
With the skull data and the tissue depth guidance in hand, the reconstructor builds up the face — in Rynn’s case using a combination of digital modeling software and physical reconstruction with wax. The digital approach allows precise control and easy adjustment; the physical wax work engages the reconstructor’s hands and eyes in ways that can catch things the digital approach misses. The combination of the two reflects the current state of the practice, which uses computational tools while retaining the value of skilled hands-on work.
The muscles of the face — the masseter, the temporalis, the orbicularis muscles around the eyes and mouth, the dozens of smaller muscles of expression — are reconstructed based on their known anatomical origins and insertions on the skull. Bone often retains marks — roughened surfaces, ridges, processes — that indicate where muscles attached; these marks provide direct guidance for muscle placement.
The skin layer is applied over the muscle reconstruction, bringing the surface to the depths indicated by the tissue data. At this point, the face takes on its overall form and proportion — but with features like the nose tip, the eyelids, and the lips still to be refined.
For the Punín-2 reconstruction, one specific challenge arose early: the placement of the eyes. Rynn noted that some of his initial attempts made the eyes too protrusive — too prominent in their projection from the face — in the way that would be appropriate for an East Asian skull, which is what the Punín-2 skull superficially resembles when viewed from the front. But local guidance from people in the Chimborazo region helped him calibrate the eyes to be deeper-set, more accurately reflecting the specific character of an Indigenous Andean face as opposed to an East Asian face.
This moment of local consultation — adjusting the eyes based on advice from people who live in the region where the skull was found — is methodologically significant. It represents the integration of the kind of knowledge that a community has about its own appearance (and by extension about the appearance of its ancestors) with the more general scientific data about tissue depths and skull-to-face relationships. The result was an eye placement that looked more right to the people of Chimborazo, because it was more right for the specific population they represented.