First they created the cardboard collage; on a pre cut recycled cardboard they glued squared shape precut cardcoard. After covering one side of the cardboard they turned the cardboard over and glued shapes on the reverse side. This step was repeated at least twice, and then put aside to dry.
The second object on the mobile is made from wavy cardboard. The shape was stapled to create a 3 dimension shape looking like a shell. The wavy side (outer side) is painted with gauche. For the inner side, I added glue to the paint and with a spoon color sand was poured on the object.