Abstract: A structure-forming construction element for a toy log building set, such as those sold under the well known “Lincoln Logs”. The construction element, typically a molding of plastic material, is formed with a plurality of adjacent sockets for the reception and gripping of log elements in parallel, side-by-side relation. In a typical form, the construction element is positioned on a support, and the log elements are oriented vertically in the sockets provided. A second, similar construction element may be placed on top of the upper ends of the logs. Side walls of the sockets can be notched to provide a castellated appearance, such that a structure with vertically spaced construction elements and vertical log elements has the appearance of a castle tower.