Object Lessons is a series of short, beautifully designed books about the hidden lives of ordinary things. Fog, a cloud that touches the ground, marks the fuzzy and shifting boundary of just how much (or little) we are willing to tolerate the natural world. Viewed from beyond the fog line, it is picturesque, the stuff of postcards and viral videos; yet from within it is a menace, responsible for travel delays and accidents-including the deadliest airline disaster in history-and is a vessel of terror and contagion. Stephen Spark's Fog traces the brief history of fog from the mid-19th century, when Oscar Wilde claimed that fog was invented, to the 21st-century Pacific coast, where scientists believe fog may be going extinct, to reveal a history of our conflicting desires to eliminate and appreciate fog. Object Lessons is published in partnership with an essay series in The Atlantic.