Feynman (1956) called the double slit experiment "[…] it contains the only mystery. We cannot make the mystery go away by ‘explaining’ how it works". The photons are described by probability wave functions. The wave functions collapse to photons when measuring. However, the collapse of the wave function leads to the inconsistent/incomplete of the quantum mechanics (Penrose, 2022). In this article, we show that, the light is photons, not waves. And it is photons that produce the non-wave pattern and wave patterns in the same experiment. We refer to the phenomenon as “PhotoWave Phenomenon”. We experimentally show for the first-time the novel phenomenon that is new mystery, non-parallel-curve-double slit produces Butterfly-shape interference patterns. We show the sensitive dependence of patterns on the structures of apparatus of slits: changes in the structure of the slits result in profound differences in pattern. We refer to it as “Optical-Butterfly-effect”. The PhotoWave phenomena support Penrose’s statement. Advances in optical experiments, i.e., PhotoWave phenomena, demand a complete theory. The experiments provide the comprehensive phenomena for further developing theoretical model to study the nature of the light and the light wave theories.

pattern evolution, non-parallel-curve-double slit, Butterfly-shape interference patterns, PhotoWave phenomena, Optical-Butterfly-effect