Giorgione, one of the most significant painters of the Venetian Renaissance, is represented today by only four works we can be entirely confident are wholly his. Only ten authenticated paintings by Leonardo da Vinci are now in existence. A small fraction of Mantegna’s majestic output survives in reasonable condition. We have forty-eight paintings by Hieronymus Bosch; literary sources indicate there were once at least twice as many. Only a third of the works lovingly described by Vasari in his Lives of the Painters are now known. We have thirty-six Vermeers. He was a slow worker, to be sure, but he made his living as a painter for nearly a quarter of a century and is believed to have finished nearly a hundred.
Of course all capital depreciates. The mean service life of an office building is thirty-six years, and most components of the capital stock are not close to being this durable.
The quotation is from Art: A New History, the very latest book by public intellectual Paul Johnson.