This document provides an overview of the work of artist Francis Alÿs, focusing on his practice of walking in cities. It discusses how Alÿs uses walking as an artistic practice to experiment with reality and introduce fiction. It also examines the recordings, objects, and artworks that Alÿs produces based on his walking actions and performances. The document outlines the key characteristics of Alÿs' work, including its ephemeral and context-specific nature, and situates it in relation to other artists who incorporate walking, such as Daniel Buren. It concludes with a bibliography of relevant sources on walking, performance, and urban space.