 A problem that arises however is that as we have seen Cavendish holds that we cannot form ideas of immaterials. If so, it is not clear how (on her view) we can have the thought that immaterials might exist. Cavendish suggests very strongly that we can think and speak of immaterials in her remark that they might in fact surround us; she says that even if they did, we would be none the wiser. But still the question remains about how Cavendish can allow that we are able to think or talk about immaterials at all, if we are not able to perceive, detect or have ideas of them.