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Mapping or shaping a surface in three dimensions with dynamic visual (and audio?) feedback.
Context switching is very costly from a cognitive point of view, however especially in open office settings, it is hard to know when someone is in the middle of something or if it’s OK to ask them questions. Here is an indicator light, showing if someone can be disturbed or not. The light can show different colours indicating “busyness level”. It can either be controlled manually or linked to applications on your computer.
By integrating displays thoughtful into cities and matching their purpose with exactly the needed solutions, they become ambient. Not using (moving) screens supports the ambient character.
Make walking directions easier. The user points their phone’s cameras at their surroundings and machine learning will identify the landmarks based on Street View imagery to pinpoint their location. It can then more accurately identify position and orientation, giving directions over the real world.