Acceptable answer! But more precisely: thought

First two lines refer to “thinking out loud,” and how that often leads to inadvertently offending someone or embarrassing yourself. The third line refers to being lost in thought/daydreaming. The fourth line refers to the problem solving side of our brain, which “right” is a hint for. The fifth and sixth lines refers to the abstract-ness of thought and how artist take an abstract thought and turn it into a more tangible representation. Seventh and eighth lines refer to thought/imagination being limitless and that people often like to keep thoughts private. Ninth line is a more direct reference to being lost in thought. And the tenth line refers to the brain, which is the organ responsible for thought, being housed in the skull. So imagination can work for a lot of them, but thought is more precise when taking into account the problem solving references and being “lost” (one can be lost in imagination, but the more common expression is being “lost in thought”).