In the 21st century the foundation of the physics building was almost overwhelmed. The author sensed that the description about time and space and the principle of relativity which are the foundations of physics were not regarded as problems. When people think it is quite common and is as it should be, instead of considering it as an important problem, the theoretical physics has not been ruled by reason and nature, impetuosity soars.
Professional physicists vie with each other to stand on the top of the physics building, and add more brilliance to the realization of scientific fantasy. However, the foundation of the physics is in danger at this time. Unconsciously I realized that the danger is being upgraded. Because, at least for the present stage, it has affected too many amazing discoveries such as the inconsistency of the mechanical theory and the electromagnetics theory.
There was a very important experiment in the history, namely, the Michelson-Morley Experiment in which the optical path difference can be observed either in Galileo's velocity superposition principle or in Lorentz transformation calculation. What is different is that the result from Lorentz transformation and the Enstein's theories of relativity calculation is less than that from Galileo's velocity superposition principle. However, the Michelson–Morley Experiment got a completely negative result, which make people can not help query the premise of the derivation of Lorentz transformation and the Enstein's theories of relativity. Therefore the author’s experiment of the wave motion on the water surface caused by translating the uniform falling water drops is thought-provoking and worthy of consideration.