Marble+Runs

Check out this "around the top of your bedroom" Marble Run:
http://www.instructables.com/id/Kinetic-Marble-Track-Around-The-Top-Of-A-Room/

** Here are some homemade Marble Runs: **
http://www.youtube.com/watch?v=KXhw-b51lcE http://www.youtube.com/watch?feature=endscreen&v=ooEoex1BDVs&NR=1 http://frugalfun4boys.com/2011/11/15/make-your-own-cardboard-tube-marble-run/ http://www.youtube.com/watch?v=UGddMlM3YL4 http://www.youtube.com/watch?v=LGyZ4JbYTpc http://www.youtube.com/watch?v=EvjPH_yPcz8