Memory Palace preliminaries

I haven't posted these before.  They are my initial drawings for the Memory Palace book itself.  Only two of them were used in the end I think.  I made my brain hurt trying to work out what the tones would be for various lighting conditions.  When it is believable it seems to make a big difference.  I really like the feeling of depth that is possible if the lighting is right!  ...Now if only I could work out how to do that in colour ^-^!