The Adventures of Tintin partially deaf physicist and a regular character alongside Tintin, Snowy, and Captain Haddock. He was introduced in "Red Rackham's Treasure", and based partially on Auguste Piccard, a Swiss physicist. The leading characters do not initially welcome his presence, but through his generous nature and his scientific ability, he develops a lasting bond with them. Eventually, by the end of "Land of Black Gold", he becomes a resident of Marlinspike Hall. Normally mild-mannered and dignified, Calculus occasionally loses his temper and acts in a spectacularly aggressive manner in response to actual or perceived insults, such as when Captain Haddock belittles his
The Adventures of Tintin the series. Tintin memorabilia and merchandise has allowed a chain of stores based solely on the character to become viable. The first shop was launched in 1984 in Covent Garden, London. Tintin shops have also opened in both Bruges and Brussels in Belgium, and in Montpellier, France. In 2014, a Tintin shop opened in Taguig, the Philippines, only the second of its kind in Southeast Asia. The first Tintin shop in Southeast Asia opened in Singapore in 2010. The British bookstore chain, Ottakar's, founded in 1987, was named after the character of King Ottokar from the Tintin book "King Ottokar's