Construction - 

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The top single butterfly is stitched with two strands of thread over two strands of fabric. The butterflies on the base are back stitched with one strand of 310.

The outline of both squares are stitched with two strands of black.

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The outer line of both squares is the fold line for the top and bottom of the pincushion. When all the cross stitching is complete put a piece of batting behind the designs - cut slightly smaller than the stitched squares. Fold over and  hem with large stitches just to hold the fabric in place.Mark the midpoints of each side with a pin. Using two strands of black, whip stitch the base and top turning at each 'corner' and matching stitch for stitch. Begin at any pin at a halfway point on one side. Continue matching corners to centres until seven sides have been joined. Stuff the pincushion and sew the opening closed.

Thread a long needle with doubled length of thread. Bring the needle up from the base in the centre, thread on a button through one hole and go down through the other side of the button and back to the base of the pincushion. Tie off tightly to indent the biscornu.