It is hard to define something one knows little about - Stephen Kosslyn

Bullets are a convenient way to present the separate elements of a list. However, bullets are a bit like salt—often essential to bring out the best, but distasteful if overdone.

Like pictures, images seem to depict information about interval spatial extents. The scanning experiments support the claim that portions of images depict corresponding portions of the represented objects, and that the spatial relations between portions of the image index the spatial relations between the corresponding portions of the imaged objects.

Physics seems to have done reasonably well in studying electrons, although there is not to this day a precise definition of this term.