In the late 1990's, Sorayama was approached by the Sony Corporation to design an organic robotic form. It became the famous "AIBO" dog, now in the collection of the Museum of Modern Art and then Smithsonian Institute of Technology.

Intrigued by the effects of light on various metallic surfaces, and always ready for challenges to his technique and imagination, he began to produce a series of female robotic figures in the late 1970s; anatomically correct in form, but appearing to have been fashioned of molten silver. The term "sexy robot" was coined to describe them.