A toy building set comprising box-shaped building elements that have, in
the horizontal plane, dimensions that are integer multiples of a
horizontal module (L), and, in the vertical direction, a height (H) which
exceeds the horizontal module. The building elements have a tubular
opening at a first face. Elements are provided that have a tenon that can
be introduced into the tubular opening. At its free end, the tenon is
flexible and has protruding edges (23) for snap-effect with the second end
of the tubular opening, and the tenon has a protruding portion (21) that
serves to ensure that the tenon can be introduced only so deeply into the
tubular as corresponds to the horizontal module (L). The building set
comprises building elements (30) with coupling studs (31) on the top face
and a cavity (32) with a tubular coupling means (33), whereby two such
elements are able to interconnect with coupling studs (31) in contact with
the sides of the cavity (32) and the tubular member (33). The tube has
internal edges (40, 42) whereby a tenon can be introduced into the tubular
member with snap-effect with the internal edge in the tube.
