The Planck by Steven Sexton is a 6-foot-long (horizontal) guitar, but is not a guitar. You might be wondering that I have it all wrong, but thatâs not so. In simple words, itâs more like a piano with strings instead of keys. This seven-stringed instrument has its raised frets and offers neodymium magnet pickup. This means that you can create music simply by pressing the strings. Check out the video after the jump.