4. What are typical examples of physical, perceptual and conceptual aspects of the user interface?

- Physical aspects: This could include the physical design of the interface, such as the size and layout of buttons, touchscreens, or keyboards. It could also refer to the materials used in the construction of the interface, such as glass, plastic, or metal.

- Perceptual aspects: This could include the color scheme and visual design of the interface, as well as any audio or haptic feedback provided by the system. It could also refer to how information is presented to the user, such as through icons, text, or gestures.

- Conceptual aspects: This could include the overall user experience and flow of the interface, such as how easily users can navigate between different screens or functions. It could also refer to the underlying concepts or mental models that users need to understand in order to interact with the interface effectively.