The Chakra, and other concepts in Hinduism are not just random, they are actually based on real things. For example, the Chakras come from people cutting open Bodies for Thousands and Thousands, maybe even Millions of Years. Cutting into the Human Body could have been something that even Pre-Humans did to their own people after death. So we have no idea how long people have been cutting in to Bodies. It was actually illegal by the time of De Vinci to cut open Dead Bodies, and he was only allowed access because he was the King's Artist, and he drew all of the near-modern visuals of muscles and bone movement and everything. That is the same "Art" that Chakras came from.
And the fact that all of this is tied to Plants, and Planets and various other Concepts is called Mnemonics. It is a System of Science, through Mnemonics.
“It is India that gave us the ingenious method of expressing all numbers by means of ten symbols, each symbol receiving a value of position as well as an absolute value; a profound and important idea which appears so simple to us now that we ignore its true merit. But its very simplicity and the great ease which it has lent to computations put our arithmetic in the first rank of useful inventions; and we shall appreciate the grandeur of the achievement the more when we remember that it escaped the genius of Archimedes and Apollonius, two of the greatest men produced by antiquity.”