BEAM robotics, which stands for Biology, Electronics, Aesthetics, and Mechanics, is an ethos that focuses on building robots with simple analog circuits. [NanoRobotGeek] built a great example of the form, creating a light-tracking robot that uses no batteries and no microcontrollers.

The robot aims to track the brightest source of light it can see. This is achieved by feeding signals from four photodiodes into some analog logic, which then spits out voltages to the two motors that aim the robot, guiding it towards the light. There’s also a sound-detection circuit, which prompts the robot to wiggle when it detects a whistle via an attached microphone.

The entire circuitry is free-formed using brass wire, and the result is an incredibly artful build. Displayed in a bell jar, the build looks like some delicate artifact blending the past and future. Neither steampunk nor cyberpunk, it draws from both with its combination of vintage brass and modern LEDs.

It’s a great build that reminds us of some of the great circuit sculptures we’ve seen lately. Video after the break.

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