“Fundamentally, it was a low-tech, high-impact event,” said Zachary Goldman, a sanctions and national security expert at New York University School of Law.

Their battle unfolds in an onscreen animation, but the children assist by summoning some low-tech magic that’s just as appealing: their own exuberant energy.

The origins of the Banza product line, however, were decidedly low-key, low-tech and personal.