I found the attached paper to be quite thought provoking, particularly regarding the eidola. The paper focuses on the senses, which the author refers to as perceptions. It's a discussion on the Epicurean assertion that all sensations are true, and the author addresses this partly through examining the eidola.
Reading about the eidola in this way gave me an opportunity to ruminate on them as a proto-scientific attempt to understand perception via atomic theory. Epicurus covered a lot of ground with them (from objects, to dreams, to visions) and it's interesting to think about how these functions in early atomic theory apply to the science of perception today.
There's more to the paper than that; definitely worth perusing.