If we want everyone to participate in public life, we must design and build an inclusive public realm that is accessible to all. Public life can’t just be available to the abled, young, or healthy. Everyone navigates the built environment differently, with abilities changing across a person's lifespan. The sizeable global population of people with physical, auditory, or visual disabilities, autism or neurodevelopmental and/or intellectual disabilities, or neuro-cognitive disorders will face greater challenges if we don’t begin to more widely apply universal design principles.