Cogito, ergo sum, or I think, therefore I am, is a philosophical statement used by René Descartes, which became a foundational element of Western philosophy. From this statement comes the above design available in many different t-shirts and products. Inside of the female head there is a number of gears working. They are creating thoughts. Maybe she is thinking the following: But I have convinced myself that there is absolutely nothing in the world, no sky, no earth, no minds, no bodies. Does it now follow that I too do not exist? No: if I convinced myself of something, or thought anything at all, then I certainly existed. But there is a deceiver of supreme power and cunning who is deliberately and constantly deceiving me. In that case I too undoubtedly exist, if he is deceiving me; and let him deceive me as much as he can, he will never bring it about that I am nothing so long as I think that I am something. So, after considering everything very thoroughly, I must finally conclude that the proposition, I am, I exist, is necessarily true whenever it is put forward by me or conceived in my mind.