Fleeting moment
Time is something that is constantly moving. We tend to perceive everything around us by taking time as a variable to perceive, that is inherently, time is a function of every perception we have. Therefore how intensely we feel a moment is also a time dependent variable. Therefore, when we perceive a moment for a very small amount of time, we call that moment as fleeting moment. However, the word fleeting means to let something pass by. In that respect, every moment we experience with or sense organs are fleeting and nothing is standing still. Indicating that the moment we are experiencing right now will fleet away in sometime and we will never experience something exactly like this again.