Thank you for your great answers and I feel each response is a variant of the same underlying phenomenon. In other words, there’s no “reason” why children love seesaws and swings, rather their bodies and minds (just as it is for all living beings) evolved to feel good when (1) riding on a wave and while (2) their animal mind is subliminally referencing their hearts. The periodic rising and falling, acceleration and deceleration averages out into a feeling of weightlessness, and in this state I believe that the neurochemicals and hormones that record a state of tension/stress in body tissues, and are the basis of unresolved emotion as physical memory, dissolve into an overall sensual state via natural opiates that likewise inhabit those same tissues. This is then perceived of as a condition of resonance with the surroundings, and it is pleasurable indirectly because of these hormonal/neurochemical affects, but fundamentally because the environmental inputs have been ingested into the system and converted into a heart like rhythm. Consciousness is a wave, and the heart is its metronome. Given that while swinging on a swing the physical center of gravity rockets from the tip of the toes to the top of the head, all this motion averages out into the anatomical midpoint, the heart region and as a reconciliation of the two brain bipolar mandate. And if the mind’s subliminal focus beam of attention can remain fixated on the heart while riding said wave, this is apprehended as a feeling of flow centered in the heart. This feeling reconciles the two brains divergent agendas. All true feelings have this morphology and what makes a feeling go “bad,” is the collapse of such a frame of reference.
Why the heart? Because it is the most powerful and rhythmic muscle of tension/release and which is ever present and which can therefore sustain the feeling of flow IN INTERPERSONAL INTERACTIONS (if referenced) and which then leads immutably to sociability.
Why is a wave synonymous with sociability? Because consciousness is synonymous with a network, and therefore sociability is a physical/physic manifestation of a network consciousness, a small subset of the overarching pattern. Sociability adds energy to the network by turning physical energies into emotional bonds by way of Pavlovian conditioning most especially during the earliest imprinting phase of life. Turning raw physical energy into feelings for other things adds energy to consciousness, i.e. the network.
Why is consciousness as a wave adaptive? In other words, what good would it do for human beings to evolve a liking for swings and seesaws, why do waves feel good?
Because the anatomy, physiology and neurology of animals is organized so that episodic change can become periodic change thorough a wave function. Life is buffeting an animal from every direction and at intermittent intervals, how to cope? Internalize it as a feeling. In this way, physical, kinetic energy is captured and then is transformed through Pavlovian Conditioning into consciousness, (the dog projects its “self” into an object of attraction) i.e. psychic energy. This adds new energy to the system and also provides a calculus so as to predict where potential energy is going to be. Now, the matter of harvesting that potential energy remains.
Back in the eighties I hired some Portugese masons to build a walkway and a small patio. They did all the digging by hand and when they ran into a big rock that had to be moved, after excavating around it so three or four men could get around it and secure a hand hold, they began to sing. It was beautiful watching and hearing an ancient tune organize their energies so that soon the massive rock began to rock back and forth with increasing intensity until at just the right moment with a great heave it was up and out of the hole and on a sled. Through the song they each know when and how hard they should apply force because they were in sync in time with the song. I learned a very important behavioral principle from watching them work. Mass can be converted into moving energy by virtue of a wave. A wave function allows force to be coupled, amplified and synchronized so that that which does not conduct can be made conductive. This is how energy is harvested. Since consciousness is organized around a wave pattern, then individual’s psychic energies can be coupled and synchronized to increase the application of force around a collectively focused object of resistance. This is why kids like to ride on swings and seesaws, and dogs like to play and go for car rides. Play is how the network works at evolving nature.