I have seen figure-8 ant mills on YouTube, fwiw. It involved a "going underground" step, eg, go through a tunnel, pop out, turn and walk over the tunnel, turn a

I have seen figure-8 ant mills on YouTube, fwiw. It involved a "going underground" step, eg, go through a tunnel, pop out, turn and walk over the tunnel, turn and go back into the tunnel. I'll see if I can find it again.