Chair concept - Variation and Materials.

I took the original concept and made a second variation, one that focuses more on simplicity and reminisce of the skull. 

Variation #2
Left - Side View
Right - Frontal

Where the nasal cavity of the skull would be stands the main reclining for seating. The back can be 'unzipped' in a way that it reveals more space leading into the cranium. Again, I repeated the lighting fixture to convey a feeling of deep thought. 

I think a suitable material would be fibreglass.

Fibreglass is a great alternative to metals. It rather inexpensive, lightweight, durable, and easily formed during molding processes.