Four towers of orange blocks, 1, 2, 3 and 4 tall, on the left; a soft gold swoosh; and on the right the same 10 blocks pushed together into one pile.

Line up blocks of 1, then 2, then 3, then 4. Push them into one pile. The pile has 10. That pushing-together is a sum.

A square bar outlined in cream. The left half is gold; the right half is cut into strips, each half of what is left, alternating teal and gold, getting thinner and thinner. A last thin unshaded strip, the same size as the newest piece, is left at the bottom.

Each new piece is half of what is left. The unshaded sliver is always the same size as the newest piece, so the pieces never pass the end of the bar, and the sliver keeps shrinking toward nothing.