Interactive installation is a sub-category of installation art. An interactive installation frequently involves the audience acting on the work of art or the piece responding to users' activity.[3] There are several kinds of interactive installations that artists produce, these include web-based installations (e.g., Telegarden), gallery-based installations, digital-based installations, electronic-based installations, mobile-based installations, etc. Interactive installations appeared mostly at end of the 1980s (Legible City by Jeffrey Shaw, La plume by Edmond Couchot, Michel Bret...) and became a genre during the 1990s, when artists became particularly interested in using the participation of the audiences to activate and reveal the meaning of the installation.