shaped mosaic pieces 14 to be inserted into the grid to replicate the design shown on the pattern as shown in fig3 the tool 10 is of an elongated construction formed of an appropriate tough but resilient plastic and may have a central handle forming section 28 and mosaic piece engaging sections 26 at one or both ends each of the piece engaging sections 26 may be offset from the central handle section 28 of the tool the offset angle u03b1 may be in the range of 20 to 30 degrees each of the piece engaging end sections 26 is formed with a pair of prongs or arms 30 each of the arms 30 comprises a distal portion 32 having an arcuate inner wall 34 dimensioned and adapted to surround and frictionally engage the upper wider portion to flange portion 18 a of a mosaic piece see fig8 the interior portions 36 of the arms are separated by a relatively thin slot portion 38 the existence of the slot 38 between the arms provides for a degree of flexibility for the arms allowing the arms to flex about a mosaic piece flange and grip the flange in a relatively tight manner as detailed in fig5 the tool arms 30 are also of a tapered thickness over a substantial portion of their length the bottom surfaces of the arms being angled upwards towards the distal ends.