In this passage from Michael Crichton's "Jurassic Park," the character Tim discovers a touch screen, a technology that fascinates him. He realizes that the screen utilizes infrared sensors, which are responsible for its functionality. This moment highlights Tim's excitement and curiosity about new technology, reflecting his knowledge gained from reading.

The experience signifies a blend of awe and understanding as Tim navigates this unfamiliar device. The mention of the screen connects the story’s themes of innovation and the consequences of scientific advancements, emphasizing how characters interact with the cutting-edge technology in the park.