Abstract: Disclosed is a toy construction piece being in the form of a half-shell having a bottom portion, a top portion, a bottom wall portion and first and second pair of top wall portions. The bottom wall portion is generally octagonal in shape. The first and second pair of top wall portions extend perpendicularly to each other from the bottom wall portion to the top portion, forming together a generally pyramidal shape and defining four generally dihedral recesses between the four adjacent top wall portions respectively. Each of the dihedral recesses have a bottom in the form of a flat surface. Each of the flat surfaces have rows of outwardly projecting pegs and have an opening also having outwardly projecting pegs. The top portion has a border having two rows of outwardly projecting pegs, the inner row being downwardly recessed from the other. The border defines an opening therein and has an inner surface having outwardly projecting pegs.