Date: 15-20+ years old.
Country of origin: Unknown, probably western animation.
The drawing was artistic. In each episode the kid discovers and enters tiny worlds around him.
Once he studies his ice cream up close and notices tiny eskimo-like people in it and soon he finds himself among them.
Another time, as he lays in the bathtub, he checks his knees and realizes that they are islands for tiny people, sailing on boats, in the tub.