Exu, according to Umbanda, is a kind of spirit, which can be in different levels of light, and which helps in spiritual works.
Since, however, Umbanda is not an essentially Manichean religion, the Exu, although acting in the "negative" pole, is considered a benign being.
Exu is a guardian!
The artistic process involved previous experiences of expanding consciousness and contacting deities.
All Lua's artwork is made using digital technique in pointillism, superimposing shapes and contrasts in black and white.