Universal design refers to the principle of crafting an environment or object so that it can be used by anyone, whatever their age or ability. It stresses flexibility, simplicity and equitable use. Examples of universal design include automatic doors, which make entering a building easier for everyone; lever-style door handles, which are easier to grasp than traditional doorknobs; and ramps, which are essential for wheelchair users and also useful for anyone who can’t or doesn’t want to use stairs.