Use the marker to trace around the end of the paper roll on the clear plastic. Cut out the piece of plastic so it is just small enough to fit inside the end of the paper towel roll.
Put a small amount of hot glue along the inside rim of the paper towel roll; then, slide the plastic circle into the roll so the glue holds it in place. Start dropping the translucent beads into the paper towel roll.
Cut a second small plastic circle using the same method as the first circle. Drop the circle inside the tube on top of the beads. Drop the ruler down into the tube and measure the distance between the second plastic circle and the top of the paper towel roll.
Cut out 3 strips of cardboard from the cereal box that are 1 inch wide and as long as the distance you measured. Wrap the 3 pieces of cardboard in aluminium foil with the reflective side out. Use tape to keep the aluminium foil in place. Now tape the 3 pieces of cardboard together so they form a triangle.
Slide the triangle inside the tube so it rests on top of the second plastic circle. If you want you can secure the triangle in place with tape if necessary. Then Cut the piece of scrapbook paper so it is as long as the paper towel roll and wide enough to wrap all the way around the roll. Attach paper to the paper towel roll with tape.