Leaf-shaped cracks form in concrete with distinctive midrib pattern.
An overhead view looking downward at cracks in concrete that form the imprint of a leaf. The leaf imprint is facing towards the upper left of the image. The leaf imprint is missing the leaf's stalk. The midrib of the leaf is present in the imprint as well, going vertically down the center of the imprint. Small, slightly dark marks are seen covering parts of the concrete.