The concept of time is the human interpretation of change. This view suggests that time is not an objective reality that exists independently of our perception, but rather a subjective interpretation that arises from our experiences and our ability to understand and make predictions about change. In other words, time is a concept that we use to describe and make sense of the changes that occur in the world around us.
"Future" and "past" are two features of time that are particularly important. The idea of the future is often seen as a projection of our experiences and the models we have developed of cause and effect, while the past is a collection of memories of events that have already happened. These two aspects of time are often tied to various superstitions, such as the belief in destiny and karma, which stem from the assumption that the future and past exist outside of our memories and our ability to make predictions.
As opposed to a linear line/timeline metaphor for time, our experience of change/time can perhaps be better imagined as walking along the inside of an undulating sphere. Our experience continuously changes, existence (the sphere) remains, but we can continue to move forward for as long as our bodies allowed it.