Glimmer

Glimmers are small, insubstantial flickers of Other-Light floating in the air, they can be safely touched and walked through and are generally considered the weakest and safest Type 1 Ghost.

It is unclear whether or not these flickers of light contain any ectoplasm, or if they are purely Other-Light, with no actual ectoplasm apparition.

It is also unclear if Glimmers can cause Chill, Malaise, Miasma, or Creeping Fear, and if so, to what extent.

It is theorized by some researchers studying the problem that all ghosts eventually erode over time in a sense, slowly becoming less and less substantial, from full apparitions, to wisps, to glimmers, and eventually to nothing. This has never been proven however.