All of Osvaldo Cavandoli's La Linea are available on Youtube, for now. I love these things.
They were played as filler on the ABC for years, but it appears I was wrong to think they were made by the same mob who did the glorious claymation The Red and the Blue films, or AEIOU which made animations out of impressions in sand, which were also used to fill gaps in the ABC's schedule.
But that was Francesco Misseri and his company, someone else entirely, who specialise in animation in odd media. As well as clay and sand they use paper, ribbons and water, or so says their website. A later effort, seeming to be another example of the dire spread of CGI (but perhaps not), is Pozzie, a boy who is a water-droplet. Cute but not as amusing, lacking as it does the hilariously infuriated characters of the earlier stuff.
I suspect the attitude is: small children must be spared conflict. Which means they are spared narrative, character and drama, of course. And laughs.