This year’s anniversary edition of the Lost Museum, a special movie series that has been screened at every Long Night of Museums for the past ten years, will be departing from its usual animated fare in favor of the much less beaten path of the dreamlike music video. “Memory is the Key” is an unconventional, jarring, and ambiguous journey through the realm of memory, leading the audience down a road marked by visions of artworks—Polish paintings, illustrations, and sculptures lost in the course of World War II—to the rhythm of an electronic beat.