Here are two paintings by Rover Thomas, an aboriginal painter whose works I find incredibly moving. (I first saw some in the Art Gallery of Western Australia in Perth in December.) The top one is called Dreamtime Story of the Willy-Willy and the bottom Yari Country. Both were painted in 1989. Both are on display in the National Gallery of Victoria at Federation Square. 
These two are big, big enough that you get lost in the loping shapes of their dotted lines, and find something like the truth of space.