Kinetic Marble Track Around The Top Of A Room

Step 3 Sketch a rough track on the wall layout

Using the layout for the walls of the room you should roughly sketch where you think the track would best fit on the wall.

You may want to make a small piece of sample track for the sake of figuring out the best slope for the track around the room.  If your slope is too flat then the marbles may have a tendency to stop or hangup on the track.  If the slope is too steep then the marbles may go too fast and jump off the track when they come to a curve or a small bump (like a joint between track pieces).  My track has an average slope of about 3.5%.  Some sections are a little flatter and some are a little steeper.

Decide where you would like to add other items of interest to the track.  Some of these items may lower the track elevation more than others.

Once you have the rough layout determined it is a good idea to use blue painters tape to mark on the walls where you think the track will be sitting.  This will help you visualize if there are conflicts with other items that you haven't thought about yet.  A little blue painters tape used up now can save you a lot of time later.