Works of value usually referred to works of high artistic value, cultural value, or practical value. In the field of art, the value of a work depended on many factors, such as the author's ability, the creativity of the work, uniqueness, historical background, cultural background, social influence, and so on. In some cases, the value of a work may depend on its market value. For example, the price of a famous artist's work might rise because of market speculation, but this did not mean that its value had increased its true value. Therefore, to evaluate the value of a work, we need to consider a variety of factors, including its content, artistic conception, technique, historical background, and so on.