Kids love to make things and take them apart again, and three new building toys from Burlington-based Learning Materials Workshop support that kind of open-ended constructive play. Coloraturo is a prismatically-colorful block set, Villetta offers blocks with angles and triangles reminiscent of cottage roofs, and Tavolino combines blocks, bobbins and tubes. Karen Hewitt — artist, early childhood educator and toy historian — designed all three. Creative Child magazine recently honored Hewitt's MAD Constructs block set with the Toy of the Year and Seal of Excellence distinctions. Hewitt collaborated with the New York City-based Museum of Arts and Design to create it.