PUTNEY — Just before COVID-19 and social distancing, the Greenwood School in Putney completed an impressive collaborative project. Under the guidance of math teacher Gerrit Bollin, a planetarium/Geodome was built and erected, hexagon by hexagon. The finished structure measured 20 feet wide by 18 feet tall and consisted of six pentagons, five full hexagons, five half pentagons, and 15 base boards to build upon. Each piece was cut out from industrial cardboard and holes were drilled to accommodate builders clasps.The sections were measured by compass and straightedge, honing geometry skills. Upon completion, a projector was installed which cast accurate constellations and science films. The Greenwood students will erect the the planetarium again this fall, when campus opens its doors.