If you've ever fancied yourself as a bit of an Isambard Kingdom Brunel-type, but just couldn't face the prospect of being caught playing with Sticklebricks, Geomag is definitely for you. This ingenious modular construction system is made up of interconnecting magnetic bars that can be built into complex 3-dimensional models such as cubes, pyramids, and even dodecahedric spheres (and before you ask - no, we don't know what they are either).