Human thoughts are represented any number of ways. Beginning with prehistoric cave drawings in which early humans communicated with each other what they had seen or experienced, the means by which human thoughts are communicated has expanded greatly over the centuries.
Thoughts are represented in art, for example, paintings depicting images important to the artist; songs the lyrics of which represent the thoughts of the songwriter; so-called performance art, in which the artist(s) engages in movements or activities intended to convey his or her thoughts; poetry, in which the poet’s thoughts are put to words using more unconventional written or oral structures; and so on. Thoughts are represented in how individuals control their physical movements under various circumstances, in effect, the use of body language, either consciously or subconsciously. In the modern era of “tweeting” and social networking, human thoughts are represented by symbols and abbreviated words and sentences.
In short, human thoughts are represented by whatever means the individual experiencing thoughts chooses. Angry letters to newspaper editors and greeting cards are ways in which people communicate their thoughts. The symbol for the heart (as in the romantic “heart,” not the pump inside one’s body circulating blood) is a common representation of one’s thoughts. Cartoonists use “thought balloons” to communicate to the reader what the characters are thinking. There is no limit to the number of ways in which human thoughts are represented.