In one of his first pioneering experiments on the subject, he employed a sound wave measuring device called a Koenig photometer. Two students read poetry from extremely different languagesJapanese and Englishinto the device. He found that the device identified the speech as poetry regardless of language. When haiku was read in the original Japanese, the wavelengths produced by the Koenig photometer were the same as those produced when English verse was read.
Here, then, he concluded, was scientific evidence that people were not so different as he had been led to believe, that there was indeed a meeting ground, and all minds did in fact respond identically to the same stimuli.