Cy Twombly is famous for his abstract works depicting things which do not have a physical form, such as atmospheres and feelings.  Here is a very small selection of work, much more can be found on his website:

http://www.cytwombly.info/



By Cy Twombly, San Francisco courtesy of Bob Doran



Cy Twombly

(detail) Untitled, 1967. Oil and crayon on canvas. (1928-2011) MOCA, LA
Image courtesy of rocor

Cy Twombly

Untitled, 1970. Oil and crayon on canvas (1928-2011) Metropolitan Museum

image courtesy of rocor

Cy Twombly
Image courtesy of Steve

In-Class Case Study: Cy Twombly Image courtesey of JamesKidsArts

NYC - MoMA: Cy Twombly's Leda and the Swan

Image courtesy of wallyg