As a technical solutions consultant at Google, Christian Gijtenbeek enjoys helping others with creative solutions to complex problems. While working from home this year, the Amsterdam-based Googler noticed a dilemma of his own. “It’s more challenging to interact with colleagues and clients without the non-verbal cues many of us are used to,” he says. “How do you effectively read body language in 2D?” His answer was to add an extra dimension, in the form of a 3D figurine, with a lot of help from his teenage daughter, Janine. "We decided to build a '”mood collector'” shaped like a large Android figurine," Christian says. Christian, his daughter, Janine, and Droid, the light-up figurine they built together. The wooden robot is about four feet (120 centimeters) tall with 640 individually addressable LEDs covering its body. He uses a small microcontroller to signal each light to display a unique color. To show “moods,” Christian set up a Firebase we...