A circle, indeed. I think, the big one is -
"Watch the desires, they project and excite gunas; watch the gunas, they vibrate back in our senses; watch the senses, mind feasts on them; watch the mind, it produces the thoughts; watch the thoughts ....
.... watch the destiny, it produces karma; watch karma, it entails next physical life; watch life, it produces desires."
(The Vedic literature often talks about "mandal" - a cycle- to describe this world of objects, perhaps implying the above.)