Which aspect of design focuses on revealing the capabilities or functions through visual cues?

The aspect of design that focuses on revealing the capabilities or functions through visual cues is visibility. When a design element is visible, it allows users to perceive how they can interact with it and what actions are available. Visibility is crucial in ensuring that important functions are easily identifiable, guiding users in navigating the interface seamlessly.

For instance, the design of buttons, sliders, and other interactive elements often incorporates clear visual indicators that inform users about their purpose. A well-designed interface will highlight what actions can be taken, making it intuitive for users to understand what to do next without having to guess. This enhances overall usability and accessibility, ensuring that users feel confident in their interactions with the system.

Other concepts like feedback, affordances, and constraints play important roles in design but are distinct from visibility. Feedback pertains to the response given to users about their actions, affordances hint at how an object can be used, and constraints help define limits within which users can interact with the interface. However, visibility specifically addresses the clarity of available actions as expressed through visual design, making it essential for effective interactive design.