Humans have been fascinated with prismatic effects since they saw the first rainbow. Over three hundred years ago, Sir Isaac Newton concluded that a prism separates white light into red, orange, yellow, green, blue, indigo, and violet. This glass prism will let children see for themselves what Newton was talking about a beam of light split into a rainbow. 3" x 1" x 1". Ages 5 and up. Categories: Montessori Supplies Montessori Materials Sensorial > Color