OK, so "world's largest" is a bit of a stretch, but this one is 15 feet long and 4 feet tall. It is large enough for several kids to stand on it and be "human music notes." My hope is for us to have a lot of fun learning the functional aspects of the musical staff with the long-term goal of the kids learning to sight sing effectively by the time they graduate into youth choir.
I made the staff out of long strips of velcro (3/4" wide and 15 feet long) that I purchased off of Amazon. It sticks to the carpet in my Choir Room very well. For less than $50 I have a wonderful teaching tool that is easy to put down and easy to take up. The "music notes" seen in this picture are some theatrical light filters that I found in my closet with some velcro strips for the stems. (Point of interest: My wife teaches piano in this room on Monday afternoons. She liked the music staff and requested that I leave it on the floor for her to use as a teaching aid, but she politely encouraged me to make a more realistic treble clef symbol. With her guidance, it looks better now, but you'll have to take my word for it because I did not take a pic of the remodel.)