Why Are There Different Accounts of the First Vision?

Joseph Smith’s First Vision is foundational to our narrative of the Restoration today, but it was not always so from the Church’s beginning. So how did the First Vision go from what began as a very personal experience of Joseph’s, to growing in institutional significance for the whole Church as it has today? Also, given that there are unique differences in Joseph Smith’s 4 separate accounts of his First Vision, what role does our personal “hermeneutic” play in how we make sense of these? And what might a letter Joseph wrote from Indiana to his wife Emma tell us about the context of his 1832 account of his vision?