La Linea ("The Line") is one of my childhood memorys. Due to its short duration, usually 2 - 4 minutes, it was and still is used as an interstitial program.
La linea is an Italian animated series of about 100 episodes created by Osvaldo Cavandoli in 1969. The cartoon features a man, known as Mr. Linea, also known as Balou, Linus and streken, drawn as a single outline around his silhouette, walking on an infinite line of which he is a part. The character encounters obstacles and often turns to the cartoonist to draw him a solution, with various degrees of success. One reoccurring obstacle was an abrupt end of line. The character would often almost fall off the edge into oblivion and get angry with the cartoonist and complain about it. He was voiced by Carlo Bonomi in Italian gibberish, giving the cartoon the possibility to be easily exported without dubbing.