This paper aims to clarify the design method with a prototype by Le Corbusier, analyzing the transformation of the "Museum of Unlimited Growth" as prototype in Ahmedabad, India (1957). According to the analysis of the Le Corbusier Plans, the Carnets (Sketchbooks) and the documents of Le Corbusier's correspondence, the author categorizes the process of the transformation of the prototype into four parts, referring to the site plan composition. As a result, the paper finds two opposed ideas: on one hand, Le Corbusier expresses the universality of the museum "without façade" through the small, symbolic beamlike projections on the façade. On the other hand, he camouflages the façade with plants for the mitigation of the local climate. In conclusion, the paper clarifies that the creative process of Le Corbusier's prototype of Museum in Ahmedabad is the interaction between idealization and localization.