Abstract: An improved construction for interlocking shelves and legs includes a shelf block on the top of each of the four corners of each shelf, the block being divided into four block segments. Each leg is formed at one end with a square opening for interlocking with either the outline of a single shelf block or with two block segments from each of two shelf blocks. The other end of the leg is formed with a leg shoulder, upstanding from which is a hollow leg end piece with substantially a square cross section having bifurcated side walls to form four right angle segments. The bifurcations are designed so that two opposite bifurcations accommodate shelf aprons from two or four adjoining shelves.The system, therefore, accommodates a standard etargere system with unitary shelf blocks or an interlocking system according to the present invention having four block segments for each shelf block.