Abstract: The application relates to a canvas comprising: members of a first type, said members being inserted into the canvas and comprising, on each of their ends, a means of sliding inserted into a structure, the members having a sliding device that can modify the length of the members during the sliding, members of a second type which are inserted into the canvas, said members being flexible so as to allow formation of a flow curve, two attachment members to be inserted into the canvas and located on the ends of the canvas, said members comprising a device allowing the canvas to be maintained in the deployed state, the members of the first and second type being alternately arranged in parallel when they are inserted in the canvas, so as to form an “accordion” configuration. The application also includes modular structures, means of attachment as well as assemblies thereof.