  Quantum entanglement occurs not just in discrete systems such as spins, but
also in the spatial wave functions of systems with more than one degree of
freedom. It is easy to introduce students to entangled wave functions at an
early stage, in any course that discusses wave functions. Doing so not only
prepares students to learn about Bell's theorem and quantum information
science, but can also provide a deeper understanding of the principles of
quantum mechanics and help fight against some common misconceptions. Here I
introduce several pictorial examples of entangled wave functions that depend on
just two spatial variables. I also show how such wave functions can arise
dynamically, and describe how to quantify their entanglement.
