maybe i'll call it anchor spot

that spot out there on the deck, 0,0,0 in a certain direction, that exact center of visual field with that exact landscape point at the center, the convergent point imagined back in the brain, the imaginary connecting line, so it takes energy to keep that orienting imagination going just like any concentrated effort, one is subject to fatigue, taking breaks.  even so the imagination plays in the background so that out there running the line is still there & i "know where i am."  relative to that spot i mean.