The diagram illustrates the 'complexity' of the cell's structure.
He doesn't grasp/understand the 'complexity' of the situation.
He was impressed by the 'complexity' of the music.
(..) you do believe in anymore. No. I wish. I wish more than anything, but... ...I can't imagine you with all your complexity... ...all your perfection, all your imperfection. - You all right? - Yeah. Look at you. (..)2010 Inception