Conversely blue, a very popular colour can represent happiness and optimism as days with clearer, blue skies tend to be considered times where these emotions are more easily expressed. Many artistic contributions have been made referencing clear days with blue skies as part of the happiness or as a symbolism of the happiness the artist felt, such as Tony Bennett's Put on a Happy Face. If this were untrue there would obviously be more complaints about days with clear blue skies.
