These misconceptions give but a limited insight into the full meaning of Fuusui. Fuusui is the understanding and awareness of the natural flow of energy and the forces of nature, both on a tangible and intangible level. Hatsumi Sensei has given a number of examples to help us gain insight into it. One example given was the cycle of precipitation. Water falls from the clouds in the form of rain or snow and eventually finds its way back to the sea.
Water falls from the sky and flows downhill due to the force of gravity.
Once in the sea, water rises in the form of vapor overcoming gravity via evaporation. As it rises, it forms clouds that are then driven by the wind back over land where the process starts all over again. That is all fine and well but how does it relate to my budo training you may ask. This is where some of Hatsumi Sensei's other examples help us gain a measure of understanding. It's all about being aware of and using these natural forces at the appropriate times.