Image instantiators come in many formats: @code{xbm}, @code{xpm},
@code{gif}, @code{jpeg}, etc. This describes the format of the data
describing the image. The resulting image instances also come in many
-types -- @code{mono-pixmap}, @code{color-pixmap}, @code{text},
+types---@code{mono-pixmap}, @code{color-pixmap}, @code{text},
@code{pointer}, etc. This refers to the behavior of the image and the
sorts of places it can appear. (For example, a color-pixmap image has
fixed colors specified for it, while a mono-pixmap image comes in two