, spatially intermittent (the distance between features is much larger than the features themselves), or have a fractal form. Many of these features were first studied in the laboratory, and have subsequently been recognised throughout the universe. Examples of complexity and complex structures in plasmas include:Filamentation[සංස්කරණය]Striations or string-like structures[11] are seen in many plasmas, like the plasma ball (image above),  the aurora,[12] lightning,[13] electric arcs, solar flares,[14] and supernova remnants.[15] They are sometimes associated with larger current densities, and the interaction with the magnetic field can form a magnetic rope structure.[16] (See also Plasma pinch)Shocks or double layers[සංස්කරණය]Plasma properties change rapidly (within a few Debye lengths) across a two-dimensional sheet in the presence of a (moving) shock or (stationary) double layer. Double layers involve localised charge separation, which causes a large potential difference across 