The University Library in Cambridge has, for decades, had a blank space in front of the steps leading to the main entrance. In recent years, this has become a jumble of untidy (and unsightly) car parking. So the Library commissioned a set of fourteen sculptures to reclaim the space. Until Friday last, they were a mystery to us library users because they were firmly encased in impenetrable wrapping. But at 6pm on Friday all was revealed. And very nice they are too: cast in bronze and with a lovely patina. The central four have an added feature — designed not only to interest small children but also to test the tidiness obsession of adults.