In this paper we show how discussion about design quality or even usability is often discussion about aesthetics. First, we introduce some definitions of beauty in aesthetics. Then, we introduce how the beauty of the Web design affects the feeling of online trust, and bring forth observations about this design quality as an aesthetic notion. As a result, we present how simplicity and beauty affect the user's experience and interpretation of the design, and contemplate on how this perception may vary according to cultural background, age, and the amount of user experience. We will also envision some future trends for the aesthetics of user interfaces.