Tried two very open ended prompts: "Home robot" and "Jet engine". First one returned only two plates connected with 4 rods, second model did not produce any 3d

Tried two very open ended prompts: "Home robot" and "Jet engine". First one returned only two plates connected with 4 rods, second model did not produce any 3d model at all. Curious whether some hierarchical modeling could be applied here.