The tar pit–inspired scheme by Swiss architect Peter Zumthor to replace the eastern half of the Los Angeles County Museum of Art is a rare misstep by one of the world's most gifted architects. Surprisingly for a Pritzker-winning architect famed for his sensitivity to context and site, this ink blotch of a design shows little understanding of its park site, or, for that matter, the context of Wilshire Boulevard, Los Angeles as a whole, or museums as a building type. It should not be built.