The French expression that "the more things change, the more they stay the same" is perhaps best applicable for the moon. The observation of the moon on a daily basis will readily identify its constantly changing behaviour as it evolves from a very thin crescent at the start of a new lunation to a noticeable crescent, first quarter and eventually a full moon as part of its waxing repertoire. This scenario will then continue but in reverse order, for the waning moon will now proceed in an orderly manner from full to a very thin crescent in a similar gradual but organized manner. Of course, this changing behaviour will repeat itself incessantly in precisely the same sequence and rate ad infinitum approximately every 29 days.

Note: The image of the full moon below was taken at the minimum perigee for 2008 as well as for the period 1993-2016.