Part 3/8:
An intriguing aspect of Nagel's work involves the use of webcams and solid-state cameras, which have the ability to detect infrared light—a spectrum that most conventional cameras are configured to ignore. Inside these cameras, a filter is typically included to block infrared light, ensuring that only visible light is captured. However, for Nagel's experiments, this filter can be removed or modified to allow the detection of infrared, yielding valuable data about heat sources.