This document provides an introduction to time-based art and design. It explains that time-based media refers to art that has a durational dimension and requires the viewer to experience it unfolding over time. Examples of time-based media include video, film, sound, performance, and live art. The document discusses how video art emerged from the need to record performance art in the 1960s. It analyzes works by Sam Taylor-Johnson, Douglas Gordon, and Harold Offeh that use the concept of time passing. Photographers who work in series or sequences also work with ideas of time and memory. Light itself is time-based, and photographers like Tokihiro Sato manipulate light in photographs to depict the passage of time