Tesseract Trainer generates a full screen real time display of a rotating tesseract - the equivalent of the cube in 4 dimensions. This app also adds point textures, which give you a feel of what each of the eight faces are doing. There`s a stereoscopic option which adds 3D depth to the projection from 4D, music and numerous options to play with. I`m very keen to get feedback as to whether anyone can `see` the 4D effect here.