To pursue his passion, Felix Nai travelled to the tranquil Japanese countryside to master the art of indigo dyeing. : To pursue his passion, Felix Nai travelled to the tranquil Japanese countryside to master the art of indigo dyeing. For Felix Nai, indigo dyeing is not just a profession; it is a journey into the secrets of nature and a way to promote a more sustainable future in the fashion industry. (Photo: Freestate Productions) His inky blue stained hands and nails are the first thing most people notice about Felix Nai.