The ultimate challenge in my opinion is to create something that makes sense but can't be explained. I believe that the subconscious outsmarts logic. I create objects that may not necessarily make sense in the waking world but may very well exist in the subconscious.
I also seek to create uneasiness. We are in an era flooded with objects, objects of use, comfort, sophistication, flamboyancy... There are many objects that serve immediate comfort, yet few are made to be a companion to our recurring feelings of uneasiness.