The radio is the source of the sound

The sound enters into the paper cone which represents the pinna

The sound continues into the paper cylinder which represents the ear canal

The balloon stretched across the ending of the paper cylinder represents the eardrum. The sound vibrates the ear drum.

A plastic toy hammer represents then malleus (or hammer). It moves as the eardrum vibrates

A plastic paperclip represents the incus and receive the sound waves from the hammer

The toy stirrup represents the stapes. This is the last bones to receive the sound in the middle ear

The snail shaped seashell represents the cochlea. The oval window (opening of the seashell) receives the vibrations. The hair cells inside the cochlea are stimulated generating nerve impulses.

The red wire represents the auditory nerve which sends the impulses to the left side of the brain.

The brain (silver toy) receives the different nerve impulses which are translated into sounds.