To create a diagram of the human ear, you need to learn all of its elements. The human ear is divided into three major areas: the outer, middle and inner ear. The visible outer ear includes the eardrum. The middle ear consists of an air cavity, the small bones of the ear and the Eustachian tube. The inner ear contains the cochlea and semicircular canals. The cochlea contains the receptors for hearing while the semicircular canals have receptors for balance.
Roll the blue clay into a snake shape 6 inches long and approximately 1/4 inch thick. Lay this shape on a flat surface. Grasp one end of the snake and roll towards the other to create a snail shell shape. Leave 1/2 inch of the snake shape unrolled. Roll a ball of clay the size of a marble and set both items aside.
Cut the rubber hose into three sections, each 5 inches long. Grasp one end of the first section and bend it to meet the other end. Staple together to form a loop. Repeat for the other two sections of the hose. These will be the semicircular canals.
Lay two of the semicircular canals next to each other on the styrofoam sheet with the ends touching and one side close. Staple in place. Place the third semicircular canal with the ends touching the first two canal ends but arching vertically away from the styrofoam sheet. Staple the ends to the styrofoam sheet. Refer to the diagram for proper placement of the semicircular canals.
Set the cochlea on the styrofoam sheet so the end of the snail shell touches the ends of the semicircular canals. Place the blue clay ball over the ends of all the parts and press down so it covers all of the ends. Add more clay as necessary.