THE TRENCH

Sources: 

http://galleryoflostart.com/blog/artist/otto-dix/the-trench/

http://en.wikipedia.org/wiki/Otto_Dix

SEVERAL CIRCLES

Sources: 

http://en.wikipedia.org/wiki/File:Kandinsky_white.jpg

http://www.guggenheimstore.org/kaposeci19.html

THE FIGURE 5 IN GOLD

Sources: 

http://en.wikipedia.org/wiki/I_Saw_the_Figure_5_in_Gold

http://www.metmuseum.org/Collections/search-the-collections/210008539

MUSIC, PINK AND BLUE N. 2

Sources: 

http://bigthink.com/Picture-This/abstract-thoughts-georgia-okeeffe-abstraction-at-the-phillips-collection

http://whitney.org/Collection/GeorgiaOKeeffe/9190

THE LARGE BLUE HORSES

Sources: 

http://www.wikipaintings.org/en/franz-marc/horse-in-a-landscape-1910

http://www.ibiblio.org/wm/paint/auth/marc/

THE WASSILY CHAIR

Sources: 

http://en.wikipedia.org/wiki/Wassily_Chair

http://www.thecoolist.com/wassily-chair-by-marcel-breuer/

25A MERZ

Sources:

http://en.wikipedia.org/wiki/Kurt_Schwitters

http://www.artchive.com/artchive/S/schwitters.html

THE SPIRIT OF OUR TIME

Sources:

http://sarahsmedley1992.wordpress.com/2011/10/07/was-graphic-design-influenced-by-futurism-constructivism-dada-and-de-stijl/

http://modernart2011.blogspot.com/2011/03/mechanical-head-spirit-of-our-time.html

THE CONSTRUCTOR

Sources:

http://www.designishistory.com/1920/el-lissitzky/

http://coilhouse.net/2007/09/el-lissitzky/

WHITE SQUARE ON WHITE

Sources: 

http://badarthistory.blogspot.com/2009/12/kazimir-malevich.html

http://www.theartstory.org/movement-suprematism.htm