Yes - the main difference between -1 0 +1 is the inversion of it  (I don't know if inversion is the right word here).  ***** U L____\|/____R * * it's* more like that. L*** /|\*** R ***** D  There's a front back as well, but, well, you know... the screen is...  FLAT [ugh].  This buries the 0 within the "all open" spot and the all left and all right are  nulls, but significant nulls because they link into other circuits and into itself  as well.* The wiring would be interesting.. although I'd probably use a 3D box for  the circuit rather than trying to make everything so stinkin' FLAT.*   Ugh, electronics always imitating the paper they're designed on.* So silly. The future will laugh at us.* I'm embarrassed, but so be it.  The L and R nulls can easily correspond to True/False, with circuit representing  everything hidden in the /.