Simon in the Land of Chalk Drawings(1976)

Simon in the Land of Chalk Drawings is a British children's animated series about the adventures of a young boy named Simon, who has a magic blackboard. Things that Simon draws on the chalkboard become real in the Land of Chalk Drawings, which Simon can enter by climbing over a fence near his home with a ladder. The stories often revolve around the unintended effects that Simon's drawings have on the Land of Chalk Drawings, such as when an upset Simon draws a picture of his angry self, which goes on a rampage.