My health is good unless I abuse it. Anyway, I know I'm not telling you anything you don't already know, but I hope presenting it all from this perspective is helpful next time somebody writes to you wondering why it's so hard to pass. Feel free to use this letter if you think it would do others out there any good. Passing' is a very complex interaction of many factors which are effectively 'computed' by the brains of other people. In survival terms this is more important than even determining what another creature in fact actually is, or even if what is seen is another creature at all.
Danger can come from inanimate things too.
One can see that the brain is well developed to construct, to compute, a hypothetical 'mood' or 'personality' immediately upon the accumulation of sensory impressions. This is a possible explanation for animism, the feeling that inanimate objects are alive, plotting scheming or just being happy. The brain may compute the emotional 'mood' of a situation before total definition even begins. If this is indeed so, information below the conscious threshold would be certainly used. One example can be found in babies.