A central issue in dynamical systems and control theory is stability of equilibria. The upper right and lower left boxes in the Nonlinear Systems Lab logo connote phase portraits for a planar dynamical system. The upper right phase portrait represents a saddle point (an unstable equilibrium) while the lower left phase portrait represents a center (a stable equilibrium). The area where the two portraits overlap suggests the rich variety of problems that arise in nonlinear systems theory and control. For example, the system depicted here possesses multiple equilibria, a phenomenon which only occurs in nonlinear systems. More abstractly, viewing the logo from the upper right to the lower left suggests stabilization, a feedback transformation from an unstable equilibrium to a stable one.