Ah. Looking at this, I’d say, things teeter totter back and forth. Ideas get popular and then unpopular in waves of opposites but always progressing forward in a better way ultimately.
At the same time, power struggles between the few-on-top and the many-on-bottom go back and forth likewise and eventually, will lead to a point where we reach a kind of equalibrium – or point of stability.
Something like that. That’s how I read this image anyway.
oh! duh, I see it. It’s the back and forth but applied to “stuff”.