An art supply of a different kind - books.
Besides art related books I often buy books that will give me more depth and understanding of what it is I want to paint. I am sure we all have bought such books. The usual non-art related books may simply be reference books to such things as human-factor engineering, bird guide books, Australian native plants, book of facial expressions, etc.
Then there are deeper books which do not necessarily provide any images of the subject matter. Some are stories about something that triggers our imagination, and from this we embark onto another artwork. Here are my recent books bought for my current facination with metaphysical nature of reality.
Unity Metaphysics
A Theology of Uncreated Energies
Every Miracle and Wonder in the Bible
The Unseen World of Angels and Demons
Reflections of an Inner Being
Contact With Beings of Light
The Physics of Angels
Against Principalities and Powers
The Incorruptibles
I have not yet read most of these books.
The point is, they feed into my imagination, and quite often I get a glimpse of something far beyond anything I have read. Yet the insight feels so 'right and obvious'. These glimpses are not necessarily of a visual nature, but an image nevertheless. The image stays with my memory longer than anything the books have revealed to me so far. It is these images I wish to make visible.
So, I see these books supplying, or inspiring, me with new artworks to create.