With neo-surrealimages like this interpretation is clearly an open issue. For what it's worth the ivy entering the mouth and exiting the ear is the symbolic subject...doing whatever it's doing outside AND (unseen)inside his head (hence the title). Before I posterized the background the whole thing was a bit too literal...the posterizaton of the background imo converted the image into an invitation to react a bit more strongly to color, and a bit less strongly to form, but they both remain essential components, just rebalanced.
The idea originated as one of my kids was asking about a college fair. I was thinking about the challenge. It occurred to me that combining a college student with Ivy could be kinda cool, so off I went.