Joan Miro, who ded in 1983 aged 90, is one of my favourite artists.
This Spanish (Catalan) Surrealist artist worked across many fields, from painting to collage to tapestry to ceramic to metal sculpture, and his ideas were radical for the times. He declared "an assassination of painting", and rejected the conventional painting style.
His minimalist works have a dream-like quality, with small elements in vast space.
Seen at the Miro Foundation, Barcelona - http://www.fundaciomiro-bcn.org/