I’m making a fork with IR LEDs for Le Fonduephone, so it can be tracked and used to pick up and move the projected fruit. Press-fit battery holder and conductive paint in laser cut traces techniques from Hannah Perner-Wilson’s Kit of No Parts. So many iterations but I think I’ve figured out a better way in the process. Instead of trying to track three LEDs (to get orientation), easier to place an LED so that it illuminates the tip of the fork. The camera will be quite far from the table and the fork will be tilted, so measuring the relative distances between the three closely-spaced bright LEDs was going to be unreliable.