One was centered around Hilma af Klint. Considered to be one of the first abstract painters, she painted classical landscapes and portraits for a living, but secretly painted abstracts, under the inspiration of Spirits. Her abstract paintings were revealed to the public 40 years after her death in 1986. She uses a lot of colours and geometrical figures, circles, spirals, triangles... More here.
Peter Doig, Milky Way, (c) courtesy the Artist and Victoria Miro Gallery
The other was about Peter Doig. A contemporary artist, he paints a lot of strange landscapes. Watching his work, I had the impression of seing spiritual messages everywhere, as if the landscapes and figures were distorted because seen through the eyes of the soul rather than the physical eyes. I fell in love with "Milky Way" (above) and "Grand Riviere" in which there is a white horse and... ravens ?More on the artist here (Tate Britain).