An invisibility cloak? You might just be able to see it on the horizon…
The best books by good writers — and Philip Ball is a very good writer indeed — are sometimes the ones that don’t quite work. This brilliant study of how occultists and scientists alike have attempted to see the invisible is very much that kind of fascinating failure. Its subject is just too large — and, well, it is just too hard to see its edges clearly. Ball begins with pseudo-medieval recipes for invisibility: Take a black cat and a new pot, a mirror, a lighter, coal and tinder. Gather water from a fountain at the strike of midnight… put the boiled cat on a new dish… then put the