An infant and his mother are playing with a small fish in a tub. The tub has a knothole from which water is pouring out, so the infant is carefully holding the small fish not to let it out from the hole. In the plasma membrane in various species, from bacteria to higher eukaryotes, there are such water channels called aquaporins that selectively allow water molecules to traverse the membrane. The schematized secondary and tertiary structures of the aquaporin's monomer are drawn on his mother's kimono and sash, respectively. And, aquaporins form tetramers to function in the plasma membrane just like the pattern drawn on the infant's kimono.
Naruto Strait, a strait between Shikoku and Awaji-shima Island, is famous for the huge Naruto-no-uzushio (Naruto whirlpools) that is generated by Japan's fastest current of sea water caused by the tide. It is thanks to the function of our inner ears that we can hear the roaring sound from and feel the acceleration of the rotation of the whirlpools. We saw an illusion of the structure of the inner ear (the semicircular canals, vestibule and cochlea) in a huge whirlpool that shook us by the inner ears.