Sample book of blueprints, cardboard double-sheet printed on 4 sides with a blue pattern. 1st front side: printed area horizontally divided into two fields – top: area covered with clusters of small dots. Number 515 pasted in the top right corner. – bottom: field filled with horizontally arranged dotted semicircles with a dot in the center. Number 516 pasted on the right. 2nd side: printed area horizontally divided into two fields – top: area covered with a symmetrical arrangement of dotted octagons and dotted squares. Number 517 pasted in the top left corner. – bottom: vertical bands of dotted lines with “Goral beads threaded through”. Number 518 pasted on the left. 3rd side: printed area horizontally divided into two fields – top: area covered with a ruled paper “labyrinth”. Number 519 pasted in the top right corner. – bottom: field filled with a dotted network with dots in the center of each field. Number 520 pasted on the right. 4th side: printed area horizontally divided into two fields – top: area covered with an almost invisible dotted composition. Number 521 pasted in the top left corner. – bottom: field filled with a ruled paper “labyrinth”. Number 522 pasted on the left.