A balloon was a common decoration in both the Muggle and wizarding worlds. Balloons were used as decoration at Jae Kim's sixteenth birthday in the 1988–1989 school year. Bowling Ball to Balloon was a spell that transformed a bowling ball into a balloon. Professor McGonagall taught to sixth-year Transfiguration students at Hogwarts in the 1989–1990 school year. At the end of the 1989-1990 school year, there was a party in the Three Broomsticks Inn, which had balloons as decoration. In the 1991–19
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The Harry Potter Balloon Bouquet includes a Hogwarts balloon, two square balloons that feature emblems of the four Hogwarts houses, and two
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