A Ghost Circle is a place that is between the Dreaming and Nothingness. Its invisible, so you can't see if your going to step in one. Unformed Ghost Circles are, as Thorn explains, a "cold spot where a chill runs up your spine". Formed Ghost Circles make anything that touches them cease to exist.The Veni-Yan-Cari and Thorn Harvestar had the ability to walk inside Ghost Circles.This may be the fact that she tore off a peice of the Locust and kept inside her, or the fact that she is a Veni-Yan-Cari in general.