What is your idea of authentic existence?

Question:

What is your idea of authentic existence?

Best Answer - Chosen by Asker: Oh My God, I truly love Philosophy as a category!
How about ' I think, therefore I am"! or
If in a forest a tree falls, and there is no one there to here it, does it make a sound? DUH! OR MY ALL TIME FAVORITE;
What is the sound of one hand clapping!
Authentic existence? I don't know! My brain thinks, and I am aware! So there I am!
But it is a good question!