The low-resistance path can be either localized (filamentary) or homogeneous. The nebulous area is fairly large with an almost spherical shell and filamentary structure. In the F mode, filamentary or linear ionization patterns are formed. High power microwave breakdown at atmospheric pressure also leads to the formation of filamentary structures. A streamer discharge, also known as "filamentary discharge", is a type of transient electrical discharge. Despite this, recent high-resolution images of its dusty disk show unusual filamentary patterns. The nebula has an overall bubble shape, but with complex filamentary structures. These were diffuse filamentary clouds that are visible at high galactic latitudes. They often appear clumpy and filamentary, sometimes showing intricate shapes such as the Horsehead Nebula. High-voltage, low-energy discharges create filamentary multibranched discharges which are purplish-blue in colour.