He painted around 250 paintings but some aren't very famous at all
I do not quite see the point of asking "why". People who feel they have the talent and the urge become painters. That goes for all of them.
In 1908.
Piet Mondrian is an abstract painter born in Holland; (in Dutch: Mondriaan) He started as young painter in a late Dutch Impressionism style, painting the Dutch flat landscapes around Amsterdam....
Oil on canvas.