Vacantspace

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A vacantspace (or vacantvoidspace) is a headspace that is empty. It could appear to be a place, but no headmates appear, or it could just be a void.

Headmates not appearing could be because they don't have access to the layer/sisasystem, are in another area, or the system can't visualise their headmates well (this could be due to aphantasia, lack of practice, etc.)

Related Terms
A variaspace is a sentient headspace that was empty at first (much like a vacantspace), but then decided to constantly change its locations and appearance as soon as a system formed in it.

A blankspace is a sentient headspace whose purpose is to be artistic, acting as a canvas. When it is inactive, the headspace appears to be completely empty and could be mistaken as a vacantspace. It can become a vacantspace if the sentient entity fades or become dormant; until a trace of activity appears again.

Terms containing the -voidspace affix are only made of void (e.g, whitvoidspace, blacvoidspace); as such, they can be described as being empty headspaces similar to a vacantspace, without being one. The synonym vacantvoidspace was coined to help distinguish a vacantspace that is only void from one that is not only void, even though the terms may be used interchangeably.