This is a famous quote of his: "Every block of stone has a statue inside of it, and the job of the sculptor is to discover it." So I think that what Michelangelo was getting at is that we create by perceiving, and that perception itself is an act of imagination and is the stuff of creativity.
Esta es una de sus célebres citas: "Cada bloque de piedra tiene una estatua en su interior, y el trabajo del escultor es descubrirla". Pienso que Miguel Ángel quería decir que creamos al percibir, y que la propia percepción es un acto de imaginación y es la materia de la creatividad.