Have you noticed that consistent, right behavior is required to provide something of value. Routinely investing, exercising, painting, composing, and whatever, and if you keep doing it consistently—regularly and every day—you become a master at it and reap the maximum gains. This hold true for consistent lazy behavior too that is a path to becoming the very best procrastinator. I would know.
So described, consistency/constancy implies regularly occurring phenomena that repeats itself. Human behavior notwithstanding, I can also see consistency in far more exciting and less mundane things. For example, mathematics is the most reliably consistent phenomenon there is. One plus one is three. It is absolutely exact. The end. I think that is astonishingly beautiful.
Computer code without bugs is consistent and has predictable outcomes. For example, depending on the difficulty height and change, Bitcoin pushes constantly out new blocks approximately every ten minutes, as per its code.
Even as complex as nature is seemingly consistent as evidenced by chaos—constistent feedback loops, repetition, self-similarity, fractals, and self-organization.
In addition to the fractal illustration above, fractals are also tree branches spreading out sporadically in the sky, waves splashing violently on a rock and dispersing quietly, and thick smoke dissolving in thin particles in the air. In chaos lies certain familiar consistency.
Relatedly, cycle of birth and death that is shared across the living and non-living organisms, is beautifully constant across time and place.
Moreover, my consciousness—the quality or state of being aware especially of something within myself—is continuously and consistently built out of stimuli that my basic human senses pick from internal and external world. Then my brain decodes and encodes the stimuli and creates consciousness. To be conscious and alive is one of the most underrated reason to be grateful for.
Consistency in art, like symmetry, is pleasant to look at. Then again abstract art can be chaotic just like nature. Chaotic parts in abstract art are in agreement with each other, thus harmony emerges as a whole.
Art is also films, and therefore films that violate continuity are not consistent across the plot anymore. For example, the multitude of plot holes in last few seasons of Game of Thrones TV series lost its continuity.
Continuity is also broken in music when the rhythm breaks and becomes inconsistent. That is why you hear similar-sounding music decade over decade because people are afraid to break cliché, old patterns because, after all, they work.
Mental impairments like depression show abnormal neural activity as evidenced by brain studies. It is not consistent with an ordinarily-functioning brain activity. Though can any brain activity really be inconsistent, given that the brain adapts to situations that demand such activity to survive however maladaptive it is?
So described, human behavior, mathematics, nature, consciousness, art and design, musical rhythm, films, and mental impairments all show consistency. I think it is everywhere we look.
But logic of some women are not always consistent, however. Then again, if she is chaotic then it has consistent elements, as evidenced by chaos theory. (Sorry for the blatantly bland and cliché gender stereotype of women which is obviously not true.)