In a Trance is just the sort of genre-defying work we at Peanut and punctum and, as it happens, Jeffrey Skoblow, revel in. It is a book-length essay by a fiction writer. It is a fictional essay by a literary scholar. It is a gallant assay by a smart man who thinks while he walks, and he walks a lot. The book is a meta-meditation on Paleolithic cave drawings and the humans who ponder them. It is…