In 1953 ... the Central Intelligence Agency began a top-secret program called MK Ultra. It included exotic projects that decades later provided much critical fodder for commentators and comedians: exploding cigars, poison-laced toothpaste, hallucinogenic serums. And as [revealed] in a video interview with professional spies at the exhibition "Spy: The Secret World of Espionage," ... at Discovery Times Square, it even included the hiring of a magician, John Mulholland, as a C.I.A. consultant. Drawn from the immense private collection of the intelligence historian H. Keith Melton, and the collections of the C.I.A., the Federal Bureau of Investigation and the National Reconnaissance Office, are objects ranging from a poisoned needle, hidden inside a coin, to [a] well-preserved rat with a velcroed body cavity that was used by Americans in Moscow for exchanges of information without agents' actually meeting. The rodent, treated with hot pepper sauce to discourage scavenging cats, was easily tossed from a passing car for these "dead drops." The gadgets here are full of concealments and misdirection; nothing is what it seems. But the objects selected by Mr. Melton - whose collection of over 9,000 spy devices, books and papers has also helped stock the International Spy Museum in Washington - are not presented simply for sensation's sake. We end up glimpsing what these ordinary objects actually accomplished and what was at stake when they were used. The show could have been stronger if that context had been made clearer, but even with its gadget-centered focus, we learn that this great bag of tricks was no mere game.