What is 'Truth'?

Looking through the notes from class this week, I noticed the writing prompt of "How do we know when something is true?"  I was immediately stopped by that question, as I sit here looking at 'trees' fashioned out of fabric and pieces of plywood, a 'stump' made of styrofoam, and a child standing in a cow costume. In drama and theatre, we are constantly asking the audience to suspend their disbelief in order to journey into the imagination of the world created. We use the same slight of hands that a magician would, and see things that may not even exist-- a beanstalk growing out of the audience, a golden egg, a giant.

I recognize that data, charts, observable experiences and concrete scientific knowledge are important aspects in defining truth, but I also wonder about what is not seen that defines truth for a person. Like an iceberg, 'truth' is only what we see on the top, but the part we don't see is made up of years of lived experiences, perceptions, worldview and beliefs. While there are some things that are indisputably true, I wonder how much is really in the grey area.