Giordano Bruno’s theory of the “shadows of ideas” (De umbris idearum, Paris 1582) exposes a gnoseological paradigm founded on a new equilibrium among the three “worlds” or “degree” of Being: metaphysical, natural and logical. It envolves that human cognition, experience and thought proceed from nature, while the whole physical universe belongs straightly from divine essence. Then an unique and eternal substance projects itself from natural bodies on human mind through sensory experience and imagination: the fragmentation and scattering of thruth of an infinite variety of raw data of experience makes arise the need for a regulative method, capable of composing them in an vision unified, as close as possible, how the complexity of natural cosmos is.