János Kass IV

János Kass's bright primary colours and joyful line combine to create the happiest illustrations. These examples are from a 1982 book of Hungarian Folk Tales. 

János Kass III

Szélkiáltó is a book of poetry by Károly Tamkó Sirató illustrated by János Kass (1927-2010) with beautiful linear imagery influenced by traditional Hungarian folk art.

János Kass II

Some more illustrations by Hungarian artist János Kass, a perfect Happy Easter in pictures.

János Kass I

János Kass (1927-2010) was a sculptor, graphic designer and printer, who also worked in film and animation. He illustrated over 400 books and was honoured with many awards in his life time including Hungary's highest award, the Kossuth prize. 
János Kass's style, as shown here, is a mixture of fine black lines and broader colour lines there is no mixing of colour, which is kept bold and singular. 
This is not János Kass's only style of work, but it is very distinctive and instantly recognisable as well as being bright, fun and happy.