Doppler Effect

The change in frequency of a wave for an observer moving relative to the source of the wave ... or thereabouts.
transoptic:

Utagawa Kuniyoshi, Kiyo-hime turning into a dragon as she lifts the bell of Dôjôji. ca. 1845.

transoptic:

Utagawa Kuniyoshi, Kiyo-hime turning into a dragon as she lifts the bell of Dôjôji. ca. 1845.

(via zyzol07)