Interaction design is becoming more and more complicated for it involves many more fields that traditionally are regarded as irrelevant to interaction design, and it keeps incorporating other knowledge to strengthen and justify itself. Focus shifting from functionality to context of use, it changes inherently with human perception. Interaction design is perception design per se, because it connects designer and user, and then embodies reflection generated by them. In this paper, I first introduce the aesthetics in art and interaction design respectively, then I propose four dimensions to use aesthetics as a tool to examine the whole interaction design as a whole. Similar to critical design, it provides another criteria to judge the design, triggering a new point of view of how this interaction is justified. At last, I summarize the common points shared by four dimensions, propose of a concept of communicative aesthetics, by which both designers and users could possibly justify their designs and interpret designs in a correct way.