There was a trick where you drew a circle, selected it, then there was a way to drag it around, leaving behind copies (option-drag?), which if you did it slowly

There was a trick where you drew a circle, selected it, then there was a way to drag it around, leaving behind copies (option-drag?), which if you did it slowly and carefully, gave a decent approximation of a pipe. I remember drawing lots of intricate pipe networks as a child.