his appearance by smoking from a magic pipe. The title character in the 1944 stage play Harvey, later adapted into a 1950 film starring James Stewart, is a six-foot, three-and-a-half-inch (1.92 m) tall rabbit, who is referred to as a "pooka". A pooka appears in the 1959 Disney film Darby O'Gill and the Little People, in the form of a horse, looking ordinary at first, but revealing its true colors quite literally by its hide changing colors. It knocks the title character Darby down a well into a cavern full of leprechauns within the hill Knocknasheega, and later leads his daughter Katie up the same hill, causing her to become mortally wounded when she falls from a cliff. Piers Anthony's novel Crewel Lye: A Caustic Yarn (1984) features Pook the Pooka, a ghost horse with chains, as the mount of Jordan the Barbarian. Pook's daughter Peek shows up in subsequent books. The Grey Horse (1987) by R. A. MacAvoy, an Irish fantasy set in the time of Parnell, features a púca the form of a Connemara pony. In War for the Oaks (1987), an urban fantasy novel by Emma Bull, a phouka protects the human main character in a war between the faerie folk. He is depicted as a mischievous trickster character who can take the shape of a dog and a man. Pookas appear in children's television programme Knightmare (1987–1994). They are presented as a threat, either malevolent or mindless, and appear as floating green entities with swivelling eyes and prominent cheeks. These pookas have plants growing from their head and generally appear in wild areas such as woodland or overgrown ruins. In Peter S. Beagle's novel Tamsin (1999), the pooka appears as an untamed, untrustworthy being who deigns to assist the protagonist Jenny. As in folklore, this pooka is a shapeshifter who most often appears as a wild pony. In all his forms he is black with golden eyes. In the Merry Gentry book series (2000–present) by Laurell K. Hamilton, one of the main characters, Doyle, owes part of his heritage to the phouka. In The Spiderwick Chronicles (2003–2009), a children's fantasy book series by Tony DiTerlizzi and Holly Black, a phooka is among the many faeries and fantastical creatures encountered by the Grace children. It is portrayed as a bizarre but harmless creature which talks in riddles and behaves in a similar manner to the Cheshire Cat