tune the math · watch the strip
Unfolded path — the swim, unrolled straight0 px
Physical strip — one pool length (the path folded on)0 px
A “down-and-back” rep is longer than the strip, so the unfolded path (top) is folded onto the physical strip (bottom) like a triangle wave — down the pool, turn, back, turn. Each dot is a swimmer in their own colour; the white tick marks the furthest swimmer, and the first pixels at the start wall flash red → orange → green before each send-off.