Ah, that's what I was looking for thanks.
ps: interesting commentary on the Stainsor's wall effect. Parmenides would beg to differ. For it was said,
"Helplessness guides the wandering thought in their breasts; they are carried along deaf and blind alike, dazed, beasts without judgment, convinced that to be and not to be are the same and not the same, and that the road of all things is a backward-turning one"