An old CD case can turn your smartphone into a 3D hologram projector. Okay, this video posted by YouTube reviewer and life-hacker Mrwhosetheboss might not bring your Star Trek dreams to life, but it’s not bad considering it’s a budget hack.

What you’ll need:

  • Graph paper
  • CD case
  • Tape or super glue
  • A pen
  • Scissors
  • A smartphone
  • A knife or glass cutter
  • And a hologram-specific video downloaded from the Internet.

(We recommend adult supervision and assistance for this project, as cutting the CD case can be quite difficult. Also consider wearing gloves to avoid injury when cutting the rhombus.)

Watch the video for instructions on how to make your own.

Video credit: Mrwhosetheboss