The Frayer model is used to explore a new topic. Often the center oval is the topic being studied. The surrounding areas usually make up the definition, facts or characteristics, examples, and non-examples. Here, one of the most important boxes is the non-example box, as it helps students deepen their understandings by making connections to other areas that are opposites or that are similar, but different in some way. Non-examples should be used more in mathematics classrooms.