Use this paper with anaglyph red-cyan 3D glasses: draw on it with a thick black pen, and your drawing will appear to float above the paper. This 3D paper features a five line-per-inch grid with a medium offset between the two different colored grids. The medium offset is probably the best version for most viewers, striking a good balance between 3-D effect and visibility/eye strain. You might want to experiment with the small and large offset variations, too.
