Ultra-Orthodox Jews have a separate education system
The heads of 30 ultra-Orthodox Jewish schools in Israel have taken out a front-page advertisement in a newspaper to warn their pupils of the dangers of the latest student fad - collecting picture cards of leading rabbis.
The principals' message - printed in an Orthodox newspaper, Hamodea, on Friday - said students only cared about collecting a full set of cards rather than honouring the rabbis for their spiritual qualities.
Secular children in Israel collect pictures of characters from the popular Harry Potter wizard stories, but ultra-Orthodox children trade pictures of bearded, black-robed rabbis.
"Torah Personalities" says the cover of one pack, referring to the name for Jewish scriptures. "Learn about our Torah leaders: collect a full set."
"The children don't concentrate on prayers or studies," the principals said, "only on getting more cards."
They condemned what they said were huge sums of money being wasted, and appealed to parents to stop the practice.