Load-bearing furniture from folded material

An item of load-bearing furniture made from foldable materials comprised of:

• one or more base supports with bevelled crenellations projecting upwards along at least two upper edges;
• one or more hollow beams in the form of a triangular prism with a flange projecting outward from one corner of each beam, each made from a planar panel divided into at least five sections along four score lines, with the flange comprised of a minimum of two sections of the panel whereby the surfaces of their interior faces are in contact with one another and nearly coplanar;
• the arrangement of said beam(s) such that they are laid across the crenelated supports with their triangular cross sections nesting between the bevels, the bevels supporting loads on the beam(s), and the flanges being received by slots formed between the cancellations.