Sonia Delaunay oil paining called 'Colored Rhythm'. I first learnt about this artist when I was researching an art deco project. I really like the geometric shapes she has created and her use of both muted and bold colours.
Fashion illustration by Sonia Delaunay, 1923. Also here: http://surfacepatterndesignrepeats.blogspot.co.uk/2011/12/sonia-delaunay-ukraine-18851979.html and here: http://www.wikipaintings.org/en/sonia-delaunay/fashion-illustration-1