From the steppes of Mongolia to the Day of the Dead Festivals in Mexico, Chris Rainier’s book “MASK” offers readers an epic collection of photographs of ceremonial masks. Rainier traveled to six continents over the course of 30 years to create the book, which includes accompanying text by acclaimed travel writer Pico Iyer. Follow the link in our bio to see more on #PDNPOTD. [Photo: “Haymen, (schab) Masks, Tauplitz, Austria,” © Chris Rainier]