After six grueling months of hard work on his famous Four Freedoms, Rockwell did a whimsical cover to relax. Although lighthearted in nature, Rockwell’s 1943 April Fools cover still features the painstaking amount of detail for which the artist was known, packing odd and amusing details into almost every square inch. The cover concept proved so popular with readers that Rockwell did two more such April covers for that decade, in 1945 and 1948. Today, readers still delight in scrutinizing these covers—and even find new errors from time to time. Can you spot all of them?