Abstract: Insert piece provided with first coupling parts and complementary second coupling parts that cooperate with each other for mutually coupling insert pieces wherein the insert pieces are provided with a foot in which through holes are provided, whereby two spacers extend on the foot on which the first and second coupling parts are provided, whereby a first part of the through holes is located in the extension of the spacers and a second part of the openings is located next to the spacers, such that a first insert piece can be coupled to a second insert piece by inserting the first coupling parts of the first insert piece through the through holes next to the spacers of the second insert piece and moving them until the first coupling parts cooperate with the second coupling parts.

Abstract: A building block formed of a body having one or more insert pieces, whereby first and second complementary coupling parts are mainly formed of the one or more synthetic insert pieces so as to be able to couple such building blocks to one another. The first and the second coupling parts are complementary in such a way that, after the adjacent building blocks have been coupled to one another in an immobile manner.

Abstract: A building block formed of a body having one or more insert pieces, whereby first and second complementary coupling parts are mainly formed of the one or more synthetic insert pieces so as to be able to couple such building blocks to one another. The first and the second coupling parts are complementary in such a way that, after the adjacent building blocks have been coupled to one another in an immobile manner.