Sentence:  in his motherland ; in the spacious hunting grounds of `` Uncle Sam '' ; in the exciting salons of his lovely , brilliant Paris - mistress of gaiety - excess and abandon - world theatre of new found freedoms in <WSD>tone</WSD> , color , dance , design , and thought . 
Meaning of the word marked with <WSD> tags:  the general atmosphere of a place or situation and the effect that it has on people