Calder geometry abstraction proposal: tangible models
Positions and rotations in 3D space are unintuitive for people who aren't well versed in geometry. Artists are instead more used to thinking about space tangibly. Typically, when making sculpture additively, one will start with an armature, which is a skeleton of the final creation, and then and then attach things to build up the final form. Armatures are posed by holding certain parts and moving others. Pieces are connected to joints.