In this activity, students explore Daisyworld, a model of a self-regulating system incorporating positive and negative feedbacks. The model explores the effect of a steadily increasing solar luminosity on daisy populations and the resulting planetary temperature. The activity was developed to introduce upper level undergraduate students to the concepts of dynamical systems modeling. The exercise guides students through some of the mathematics behind the modeling. Learning goals, context for use, teaching tips, materials, assessment tips and related resources are provided.