Patent ID: 8105128

Claim:
An injection molded toy building element for a set of toy building elements that are capable of being interconnected in a releasable engagement, comprising: side walls; a top having an upper surface that extends from the side walls, and a plurality of projections extending upward from the extensive upper surface; an open bottom; and an interior that is accessible through said open bottom for receiving a plurality of said projections of another said building element of said set; wherein the interior includes a plurality of contact surfaces that are disposed for interconnecting in a releasable engagement with said received projections; wherein the interior further includes at least one hollow member that extends downward from a portion of the extensive upper surface that is disposed between at least two of said projections; wherein the at least one hollow member is open through the extensive upper surface; and wherein the hollow member has an outward slope in a direction extending from the bottom toward the top.