Orthodox Jews are forbidden to watch television, go to the movies or museums where they might see images of naked men and women. Women are forbidden to appear in public without covering their hair or to wear clothing that fails to cover their lower arms, their necks or their knees.
Men are required to wear what we regard as a uniform -- a yarmulke or a black hat, black pants, and a white shirt.
There are foods Orthodox Jews cannot eat and books they cannot read. In other words, the secular world in its myriad dimensions is off limits to them.
What my daughter saw as she strolled through Orthodox communities in Jerusalem or joined the huge crowds at the Western Wall were hordes of Orthodox Jews, separate in dress and manner, carrying a prayer book in one hand and in the other hand, the whole of the secular world, their iPhone.