A defining question

[tessa]

...implies that truth exists only as a matter of perception, and not as an objective absolute.

I responded to this part mainly because it is my firm belief that perspective (I shy away from using your term, to distance my meaning from the sensory-related definition 'perception' denotes) is what makes the world go around. But perspective is not truth, not in any form. It is a subjective evaluation at best. At worst, it's self-delusional propaganda.

Basing the definition of truth on an adherence to reality begs yet another question-

Which reality?