The dimensional design principle focuses on creating an amazing experience in spatial computing. By adding depth to your app, you make it feel more real and immersive, going beyond the limits of a regular screen. It's all about utilizing the space around users to make them feel like they're part of the digital world.

Consider the physical space your users might be in. It's crucial to design your app to function well in any space, from a tiny apartment to an expansive office. For example, take Apple's TV app. When users move a window, the system ensures it doesn't interfere with physical objects like a chair in the room. And when users release the window, the app becomes fully visible, enabling people to interact with it. The system handles how the windows fit into users’ space, so designers can focus on the content.

Moreover, dimming is a simple yet effective way to maximize the spatial experience. By darkening the real-world view when a video plays, it enables users to focus on the content while still being aware of their surroundings.