force_health - Dunno. Only appears in ants.
can_block - This object behaves as an obstruction. You
can't walk thought it. (More specifically, trying to
move through it will set the blocking flags)
unactive_shield - Dunno. Only appears in hidden_walls.

Sub-function: states
Usage: (states [spe] [state-pair]*)
Defines all the different positions the object can have. The
[spe] is the .spe file where the frames for all these states
can be found. Each [state-pair] is of the form
(state frame-list). The state is just a token to refer to
this state by (as in (set_state) and (state)). The frame-list
is a lisp form containing the names for all frames for this
state. Examples include a single frame, "bomb.pcx", a list
of frames, `("one.pcx" "two.pcx"), and a sequence of frames
built by the (seq) function, (seq "f" 9 12) which evaluates
to `("f0009.pcx" "f0010.pcx" "f0011.pcx" "f0012.pcx").

No example is given because it probably wouldn't be helpful and
because there are TONS in the source.
;;------------------------------------------------------------------------
Function def_image
Usage: (setf [some_image] (def_image [spe] [name]))
Returns: dunno
Lets you refer to the image [name] in the [spe] .spe file by the token
[some_image] so you can use it in a call to (put_image). Not very
descriptive, I know. For example, you might say:
(setf an_image (def_image "art/misc.spe" "some_image.pcx"))
(put_image 20 5 an_image)
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