Extreme temperatures and humidity can build very intricate and delicate ice designs, some developing slowly, while others form in just hours. All of these one-of-a-kind designs are also dependent on the surface structure they build up on, such as glass, rocks, the surface of frozen water or even tree branches.
Microscopic dust or cracks on the forming surface, which is the beginning "palette" for the final outcome, will affect how the patterns grow and expand over time.
"Ice Needles" or "Ice Feathers" are relatively common types of formations but every single creation is exclusively distinctive…much like a snowflake. Then, if ambient temperatures get even colder, these complex works-of-art can continue to grow … if it warms up even slightly, they will disappear altogether.
All images © Dave Parkhurst www.TheAlaskaCollection.com