This disclosure relates to a clip for securing together adjacent collapsible, expandable, self-locking, self-supporting structures which include a plurality of pairs of crossed rod elements pivotally joined in scissored fashion to each other and to hubs having openings therein, the structures having at least one hub of each section adjacent each other, and the clip having at least two stems with each stem being interlockingly received in an associated opening of the adjacent hubs to thereby secure the structures to each other in any one of a plurality of different configurations.