Bih has his students at Taiwan University "rub for treasure" by looking for human expressions in rubbings they make from tree limbs, tire treads, the surface of a paved road and keys.
「拓圖尋寶記」是畢恆達帶領台大學生拋開慣性的視覺思考，拓下一幅幅樹幹、輪胎痕跡、柏油路面及鑰匙的表情。