On this page, we shall have a closer look at the graphics files, including textures and sprites, that can we extract from the installation folder with the help of the XWE Editor. Taradino Cassett has kindly assembled an extractable archive, which you're free to download over at Doomworld.
Some of these textures have been named by the developers in most curious and interesting ways, lending us some valuable, and not seldomly humorous, insight into the creation process and the identity of certain objects and locations.
AOCHRIST.anatomy of christ.bmp
The book with the blue binding that we find inside Charles Randall's Vicarage, along with the second volume of Florentine's Journal and a copy of Edgar Allan Poe's The Pit and the Pendulum, is apparently called The Anatomy of Christ.
Extracted from the DEMO1.DAS folder, this texture depicts the experimental set-up of chemical apparatuses, found in the Laboratory in the basement of Charles Randall's Vicarage. The liquid substances inside the test tubes actually have the same colours as the three types of Vials that we can use to replenish our health.
Apparently, the developers initially meant to implement one of these, nowadays considered old-fashioned, telephones in the Mansion's Study.
Although I'm fairly sure that this chalked map cannot found in the actual game, I'm curious as to where it was supposed to be implemented. Possibilities include the Mausoleum, the Caverns or the cave system on the Island of Threads that eventually leads us to the Chamber of the Soulstone.
Extracted from the DEMO3.DAS folder. As implied by the titles of these two textures (hospital lamp and hospital floor), at some point in the development process, the player was supposed to explore a hospital, potentially the one we see in the final cut-scene of the game. If my memory does not fail me, the texture for the electrical lamp was infact used in the area preceding Florentine's Observatory, in which attacked by the brown Urge creatures under the flickering light of various defective lamps.
SPECWA1.wall in special loc.bmp
This wall texture was apparently planned to be used in a "special" location in the Mansion. The depicted agony faintly evokes the Porte de l'Enfer of Auguste Rodin, a monumental sculptural group work which is based on a scene from Dante Alighieri's Divine Comedy.
IMP1.imp in shadow rm.bmp
I don't think I've come across this little imp statue anywhere in the game. An Imp is a mythological creature, similar to a Goblin, often considered mischievous, that originated in Germanic folklore. Apparently, the goblin sprites and the anguished wall textures just above were originally meant for a demo location which has been cut from the finished game.