If a tree falls in a forest and no one is around to hear it, does it make a sound? is a philosophical thought expriment that raises questions regarding observation and knowledge of reality. If you have an idea/opinion/argument but you do not express it, does it exist? The question, How many angels can dance on the head of a pin? is a metaphor for wasting time debating topics of no practical value. If you ask for feedback, do not be surprised if workers, clients, students find issues with the quality of your, or your organization's, performance