The artist is using the appeal of pathos (emotional response). They play on the viewers association of the sky with endlessness, as it is often described as such. Additionally, most people associate the sky with birds which are used as mascots which hold value for freedom, like America's bald eagle. Lastly, people have an involuntary reaction to positive stimulus by smiling.
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rauschenberg merged the realms of kitsch and fine art, employing both traditional media and found objects within his "combines" by inserting appropriated photographs and urban detritus amidst standard wall paintings.
Answer:
Yes
The were successful and they were also in a band