In 1854, a Spanish vocal pedagogist named Manuel García (1805–1906) became the first man to view the functioning glottis in a living human. García developed a tool that used two mirrors for which the Sun served as an external light source.[58] Using this device, he was able to observe the function of his own glottic apparatus and the uppermost portion of his trachea. He presented his observations at the Royal Society of London in 1855.[58][59]