Using a simple umbrella, Joe Saavedra has created an device that uses "light and sound spatialization this umbrella creates an immersive, mobile, and highly personal multi‐sensory environment. Range sensing technology helps the Spatialized Umbrella react to your movement through a space". In other words, as someone gets closer to the umbrella (with the distance being measured by an infrared distance sensor), sound loops are played through five speakers around the umbrella, and LEDs generate a visual display. Here's an example of the umbrella in action:
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