A group of children on a playground, each kid clutching a slip of paper with a number on it, moves along a line drawn in chalk, comparing numbers as they go and sorting themselves into ascending order from one to ten.
Another group of children, sitting in a circle, passes pieces of fruit — an apple, an orange — from hand to hand until the color of the fruit they’re holding matches the color of the T-shirt they’re wearing.
via Teaching computer science — without touching a computer | The Hechinger Report.