Abstract: A plurality of reflective T-rail interconnector members are adapted for use with a toy block set and establish at least one pair of adjoining T-rails, wherein the first T-rail is non-parallel to the second T-rail so as to permit multi-directional slidable interconnection with a plurality of toy block configurations that are slidably, pivotally and fixably coupled to one another and which are further capable of three dimensional slidable and pivotal maneuvering with respect to one another by virtue of rail extension members, rail guide members and pivot members. The reflective T-rails may further include coupling members or, in the alternative, the reflective T-rails may be unistructurally molded so as to establish a plurality of infinitely sized and shaped T-rails which permit multi-directional slidable interconnection with a plurality of toy block configurations.

Abstract: A toy block set includes a plurality of toy block configurations that are slidably, pivotally and fixably coupled to one another and which are further capable of three dimensional slidable and pivotal maneuvering with respect to one another by virtue of rail extension members, rail guide members and pivot members. A first group of the block configurations includes embodiments with a rail extension member which consists of a first thinner segment and a second wider segment. A second group of the block configurations includes embodiments with rail guide members which are configured to permit multi-directional movement of the rail extension members therethrough. A third group of the block configurations includes embodiments with pivot members which are configured to permit multi-directional pivotal and slidable movement of the rail extension members therethrough. In an alternative embodiment, the rail extension members may be independent pieces.