Social constructs can be different based on the society and the events surrounding the time period in which they exist. An example of a social construct is money or the concept of currency, as people in society have agreed to give it importance/value. Another example of a social construction is the concept of self/self-identity. Charles Cooley stated based on his looking-glass self theory: "I am not who you think I am; I am not who I think I am; I am who I think you think I am." This articulates the view that people in society construct ideas or concepts that may not exist without the existence of people or language to validate those concepts.