There was a kid at my school who wrote on both sides, on top of eachother with both red and blue pens. He then brought in red/blue 3d glasses, and would close o

There was a kid at my school who wrote on both sides, on top of eachother with both red and blue pens. He then brought in red/blue 3d glasses, and would close one eye to filter out red/blue and read the notes.