Student Experiments: Dominant and Subordinate

So today was the first day of 3d Design Class. These students have never made anything three dimensional; all their art experience is drawing and painting. I tasked them with bringing in things from home and/or using what they found in the classroom and experimenting with what it was like to make three dimensional drawings; to attach materials together to make something that might stand up or take up space.. They were to have either Line, Plane, or Volume be dominant