Imagine a container, with balls of diameter 1x and 10x, moving randomly in all directions. These balls are mixed, so it is a low order system.
Now this container is connected to another container via a slightly modified Tesla valve which has the passage of width 8x. So this passage allows only the balls of diameter 1x and filters the 10x balls. The image below is a section of the Tesla valve, many such can be connected in series to increase the efficiency.
In the allowed direction, the probability of a ball making it through the valve is high. But the probability of a ball travelling in opposite direction is very small, as it has to take the correct path all the time, and even if it takes a single wrong path, it will end up moving in the opposite direction.
Now after a period of time one container has mostly 10x balls and another container has only 1x balls. It is as if though they are sorted automatically, hence a higher order system came out of a lower order system.
Does this work? Is second law of thermodynamics not work in this scenario? What's happening here?