a theophany is an experience of the presence of God, without necessarily involving any of the senses - hearing, sight, touch, smell, sound. An apparition is just that, a vision of a heavenly being, usually Mary or a saint, although Catherine laboure and Sr. Faustina reported seeing and hearing Jesus himself. Sometimes an apparition is accompanied by hearing words or a message, or music, or smell as of roses etc. Others have reported “locutions”, hearing a message without a vision.