Dynamic computer simulations seek to engage the viewer by providing an intuitive representational mapping of common knowledge features to new knowledge concepts. Our research aims to provide enhanced understanding of complex systems through participatory interaction with our dynamic simulation models. Previous research has indicated that virtual and tangible models are well suited for use in informal education spaces, as they increase user interaction and curiosity amongst children and adults. We designed and implemented an interactive virtual environment as well as an interactive tangible “water computer” to represent the complex interspecies behavior of Lotka-Volterra predator-prey dynamic system. We designed our simulation models for use in informal STEM education settings, with a design focus on enhanced interactions and reflexive thinking.