Didn't know about this part of the story "But it was another PRL reviewer’s rebuke that opened Leonhardt’s eyes wide. It said he was not alone. The assessment, routinely shared with Leonhardt, indicated that the reviewer had been to two meetings in the previous months “in which John Pendry discussed his group’s efforts on the same issue, calling it a cloaking device or their Hogwarts project in reference to the cloak of invisibility associated with the Harry Potter series.” Pendry and his colleagues, the assessment added, “supposedly have filed a patent related to this work.” Hence, the anonymous reviewer declared, the work was not new and did not merit publication in PRL." - Andrew Lang