These speaker amplifiers are made from shells.
It’s cutely called the Shellphone Loudspeaker. It’s basically a real seashell that has a cutaway to fit the iPhone 4 or iPhone 5. It’s natural design amplifies the sound by sending out through the large, open end of the shell. There is no wiring or electronic components or anything of the sort. It’s all natural and works on basic acoustic concepts.
Pretty cool, huh?