PLANKO develops creativity, cleverness and artistic expression. Because of the boards' very exact measurements (3 thicknesses = 1 width and 6 widths = 1 length) structures built are both solid and surprisingly elegant. The grooves in the boards can be used to give texture to constructions and to create very intricate models. Using grooves to build at angles calls for caution and skill, but the spectacular results are an excellent reward. Students can work individually or in groups. Provides insight into design and construction techniques. Includes manual.