In the Night Garden - Series 1: 40. The Tombliboos Build an Arch
Adventures in a magical forest. The Tombliboos build a brick arch, and the Pontipine children a stone arch. They go under and through.
The Pontipines are out for a walk in the garden when the children stay behind in the pile of stones. Inside the Tombliboo house, the Tombliboos build an arch out of their bricks, while the Pontipine children make an arch out of the stones. They all play at going under and through.