I originally thought I would anchor the tube to the side of the big box, but I could not figure out a good way to do that. I began to wonder what would happen if the tube was actually embedded in the big box. I decided to try it, to actually embed the tube in the Big Box Incline.
The addition of the embedded tube significantly changed the operation of pouring the pellets down the Big Box Incline. How so? When a child pours the pellets into the box from the top, pellets tumble down the box until they encounter the lip of the tube, at which point, the flow of pellets switches directions a 180 degrees. Of course, not all pellets fall in the tube. Some travel the length of the box and tumble out the bottom.