The present moment is changing so fast that we often do not notice its existence at all. Every moment of mind is like a series of pictures passing through a projector. Some of the pictures come from sense impressions. Others come from memories of past experiences or from fantasies of the future.
Mindfulness helps us freeze the frame so that we can become aware of our sensations and experiences as they are, without the distorting coloration of socially conditioned responses or habitual reactions.