In his Organisations d'espaces (Organised spaces), Sanejouand employs specific means —such as crane components, scaffolding, mirrors, tree planting, video projection, dropping blocks of ice from a helicopter, triggering avalanches, and so on— to reveal or alter the meaning of a given space. That space might be a museum gallery, a construction site, or a mountain valley. In each instance (with the exception of the Organisations d'espaces from the 2000s), the project—whether realized or not—is presented via a plan. A prime example is the utopian "Seine Valley" development project (1969–1972), which proposed, among other things, the creation of "permanent information centers" that would make any information available at any time, while allowing anyone to share their views and express ideas on any subject—a remarkably accurate anticipation of today's Web.