Popularization of spiral rise
An image metaphor of the development form of things revealed by the negative law of spiraling to negation. Engels said in Dialectics of Nature that the spiral development form is caused by contradictory or negative negative development. The basic characteristics of spiral rise are gradualism, wandering and periodicity.
The general direction and trend of the development of things is the forward movement from low to high, from simple to complex. But the road ahead is not straight, but tortuous, and there will be a phenomenon of returning to the starting point. Lenin pointed out that development seems to be repeating the previous stage, but it is repeated in another way and on a higher basis.