Some designs make things easier to use. Designs can restrict or enhance accessibility. For example, stairs make it more difficult for someone in a wheelchair or with mobility issues to get around. Lower counters are more useful for shorter people and children, but they could make taller people uncomfortable from leaning over too much. Some kinds of door handles are easier to open than others.
Often things that make our surroundings easier to access for some people add to ease of use and safety for others. Steps are not only difficult for people with mobility problems, but they also are involved in many accidents. So reducing unnecessary stairs and steps can make a place safer. In addition, almost everyone will need help with access at some point in their lives.
For instance, it may be harder to get around with a broken leg or twisted ankle. Easier to turn knobs help people with an injured arm or those who are already using one arm to do something like holding a child. Systems that use alternative modes for people with vision or hearing difficulties can offer options for others too. For instance, computer systems that allow font size changes are often used when someone needs to see a screen from farther away. Alternatives to audio alerts are useful in noisy environments.