Works for children by the Czech artist Josef Lada (1887–1957)
Josef Lada - Houpy, houpy, houpy, kočka snědla kroupy... (Národní říkadla)1921. Czechoslovakia
Czech Easter pomlázka is a braided whip made from pussywillow twigs. It has been used for centuries by boys who go caroling on Easter Monday and symbolically whip girls on the legs.
Josef Lada. A Czech Christmas - I've just saw such a calender :)