Abstract: A toy building set has primary building members having a first type of coupling that includes studs and complementary parts for mating with the studs. The building set also includes secondary and tertiary building members. The secondary building members have elongated bodies and a second type of coupling including coupling faces that are at least partly rotational-symmetric about an axis transverse to the longitudinal direction of the body and coupling faces adapted to grip and receive the aforementioned coupling faces. The tertiary building members include a coupling of each of the primary and secondary types.

Abstract: A receptacle for the storage of building elements for a constructional building set is constructed as a trunk having hinged parts. The receptacle is formed with one or more recesses to receive plate-shaped elements incorporated in the constructional building set. Coupling portions in the form of projections are provided along at least a portion of the periphery of the recesses to cooperate with complementary coupling portions in the form of grooves on the plate-shaped elements with a view to establishing temporary retention of the elements.