Here is an old letter seal of a Munich dealer of artists' supplies. The "Munich child" symbol, or mascot is holding brushes and a palette here. Back in the 12th century an adult monk was used in the city seal, but over the centuries he became a child.
From the stein-collectors.org website, "It is not known when the 'Munich child' appeared in the coat of arms for the first time or who gave it the sympathetic name. Some representations in the fifteenth century already show the child instead of the monk. The metamorphosis was not brought about by some order of the sovereign, but instead by artists."