Brain Builder Set -1 Convert 2-D diagrams into 3-D structures. Train young brains to think in multiple dimension with this interactive STEM tool. Brain Builder combines wooden planks with a set of stimulating puzzle cards. Per fact for even the youngest of builders-each card features a fun, recognizable 2-D object and the goal is to recreate the pattern into a 3-D puzzles structure. From picnic table and bridges to dragonflies and triangles, you will be amazed what your brain will build.