Learners will construct a model of a heart valve using a film canister, a piece of masking tape, and a piece of paper. They investigate their "valve" by altering it to see what happens and what it sounds like when the "valve" has a hole in it. This activity is a great way for learners to visually understand why the human heart sounds like it does and how valves control blood flow. [Activity is publicly available through a web crawler capture on Archive.org.]