As an unknown, although very hard to pin down yet after all, although with difficulty observable power. Therefore, seemingly may look like one of the most likely causes of the process, like "descending from above", or conversely arising from the ground.
Kama wasiojulikana, Ingawa ni vigumu sana PIN chini bado baada ya yote, kwa nguvu Ingawa Ugumu imethibitishwa. Kwa hiyo, Inaonekana inaweza kuangalia kama moja ya Sababu zaidi Uwezekano wa mchakato, kama "akishuka kutoka juu", au kinyume chake kutokana na ardhi.