I'd say either "humans" or "human beings" are equally correct. "Man" would also have been perfectly good decades ago, but it has gone way out of fashion to use the word "man" to refer to mankind as a whole because of gender politics.

All three options are grammatically correct, but the choice depends on the intended meaning. "Humans" refers to the entire human species as a whole, and can be used in a more scientific or objective context. "Human beings" is a more inclusive term that recognizes the individuality and diversity of people, and is often used in a more philosophical or humanistic context. "A/the man" refers to a singular individual, and is more specific than the other two options. This would be appropriate if you are referring to a particular man or a specific type of man. So, depending on the intended meaning, you could choose one of the following: "His creative attention revolves around humans." (referring to the human species as a whole) "His creative attention revolves around human beings." (referring to the diversity and individuality of people) "His creative attention revolves around a/the man." (referring to a singular individual or a specific type of man)

If you mean people as individuals then perhaps 'the person', if you are referring to a group of people you could say something like 'the people concerned', and if it is people in general then 'the human condition', 'mankind' or 'humanity'.