You may wonder why I have chosen to write an article about tendrils on Ipernity. It doesn't seem very related to photography. I explain why at the end of the article.

Have you ever wondered how tendrils can pull a plant up a wall or a trellis like the one in the photo? Climbing plants have puzzled biologists since the 19th century – including Charles Darwin who wrote On the Movements and Habits of Climbing Plants, which was first published in 1865. Darwin coined the term circumnutation to describe the motion of growing stems and tendrils.

In botany, a tendril is a specialized stem, leaf or petiole that is used by climbing plants for support, attachment and cellular invasion by parasitic plants. They can photosynthesize. They are formed from modified shoots, modified leaves, or auxiliary branches and are sensitive to airborne chemicals, often determining the direction of growth

When first formed, a tendril is almost straight, and while growing it slowly waves around in circumnutation. When it encounters a foothold, the end of the tendril wraps around it, securing a support.

The tendril then shortens by coiling up into a corkscrew-like helix, pulling up the rest of the plant. But rather than twisting only in one direction – impossible without twisting the plant at the other end – the two halves of the coiled section curl up in opposite directions, separated by an uncoiled stretch called a perversion, so there's no net twist. Scientists have successfully modelled perversion in a cucumber tendril.

For the 100X: 2014 Project I chose natural history. I was fascinated how a plant could climb a brick wall just using its tendrils. Once I read about how tendrils work, I set out to try and find a perversion where the tendril changes direction and photograph it. The plant I chose was slender grape, Cayratia clematidea, which was growing on a wall in my drive way.

I have posted a photo of the leaves and tendrils as well as the one above.