eng Science and Education Publishing International Journal of Physics 2333-4576 2024-09-29 12 5 232 237 10.12691/ijp-12-5-6 IJP20241256 article Hui Peng davidpeng1749@gmail.com 1 James Peng Lab, Fremont, CA, USA 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. https://pubs.sciepub.com/ijp/12/5/6/ijp-12-5-6.pdf pattern evolution non-parallel-curve-double slit Butterfly-shape interference patterns PhotoWave phenomena Optical-Butterfly-effect