At first, I see this achievement and believe it is only a circular reflection.But when I tried that,it did not work.

Then I forgot it and until today I fortunately got it.

So you may want this for help: "the infinity" means a logic device "open" and "close" over and over again,and explicitly, puzzle can not solved when you make an "infinity" in your puzzle.

And also I think it is very easy to get it if you finish the game,you may finish it in accidental chance.

If you finish the game(wow!I am still working on it!),and did not get it Or you just want it, also you think my poor English is useless for your thought,then you may want this code for help:

Chapter 4 Redefining logic
Level 1 logic basics
HSwsy8LRwcOyLEzbwcTCwrSNLCwsHB1MTCwc