"A message denotes a specific, concrete statement about the world. But the forms of our media, including the symbols through which they permit conversation, do not make such statements. They are rather like metaphors, working by unobtrusive but powerful implication to enforce their special definitions of reality. Whether we are experiencing the world through the lens of speech or the printed word or the television camera, our media-metaphors classify the world for us, sequence it, frame it, enlarge it, reduce it, color it, argue a case for what the world is like." Neil Postman
In the Eucharist, we physically eat Jesus' flesh and drink Jesus' blood instead of mentally imagining what such a meal might taste like. Read the word "taste" in the previous sentence in the richest sense, as in Psalm 34:8.
In Baptism, the baptized body is touched by physical water instead of the baptized simply believing that initiation has taken place.