Herbert and Dorothy Vogel like the most unlikable art. They own a few inches of frayed rope with a nail through it. A curved lead pipe. A black cardboard square with the definition of the word "nothing" printed on it in white.

The works, by Richard Tuttle, Carl Andre and Joseph Kosuth, respectively, are part of the more than 4,000 works that Dorothy, a 73-year-old retired librarian, and her husband Herb, an 85-year-old retired postal clerk, have collected. They started buying minimal and conceptual art in New York in the early 1960s, living on Dorothy's salary and spending Herb's on art.

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