Patent ID: 8435095

Claim:
A building block system, comprising: a first building block having a first side having a first elongated groove and an opposite second side having a second elongated groove; a second building block having a third side having a third elongated groove and an opposite fourth side having a fourth elongated groove; and, an elongated connector which is shaped and dimensioned to be simultaneously snuggly received by said second elongated groove of said first building block and said third elongated groove of said second building block, said elongated connector being a separate part which is not permanently connected to either said first building block or said second building block; said first and second elongated grooves of said first building block and said third and fourth elongated grooves of the second building block each being formed by two parallel planar walls; said elongated connector having a first serrated side and an opposite second serrated side; said first serrated side having a first plurality of vertices, and said second serrated side having a second plurality of vertices; when said connector is snuggly received by said second elongated groove of said first building block, said first plurality of vertices contact one of said parallel planar walls and said second plurality of vertices contact the other of said parallel planar walls; and when said connector is snuggly received by said elongated groove of said second building block, said first plurality of vertices contact one of said parallel planar walls and said second plurality of vertices contact the other of said parallel planar walls.