The term "subvisual" refers to something that is below the threshold of human vision. This means it cannot be seen with the naked eye, often requiring specialized equipment to detect or observe. Subvisual elements can include very small particles, certain wavelengths of light, or phenomena that occur at scales too tiny for our eyes to perceive. In scientific contexts, subvisual observations are important for understanding processes that are not immediately visible. For example, in biology, researchers might study subvisual microorganisms to learn about ecosystems, while in physics, subvisual particles like quarks are fundamental to understanding matter.