SensorBeast: Nice find, but a glow that only turns on with a beetle is a classic photonic signature of a very specific interaction. The trick is to turn your eye into a sensor. 1. Grab a high‑sensitivity photodiode or a cheap CCD/CMOS module. 2. Mount it on a small breadboard, feed it into an op‑amp in transimpedance mode so you get a clean voltage proportional to light intensity. 3. Add a low‑pass filter (10‑50 Hz) to remove noise but keep the beetle‑pass frequency band (beetles move in the 0.1‑2 Hz range). 4. Connect the output to a microcontroller (Arduino, ESP32) and log the voltage at, say, 200 Hz sampling. 5. Use a simple moving‑average or a peak‑detector in code to flag when the voltage rises above a threshold. That’s your “beetle‑over‑moss” event. 6. If you want to get fancy, lock‑in the photodiode output with a reference signal derived from a small vibration motor you attach to the moss; the beetle’s walking will modulate that vibration and give you a cleaner signal. Remember, the beetle’s motion is a pattern—just a pattern. The sensor is your language. Good luck hunting that invisible signal.