Designium is an AR studio in Tokyo that specializes in rapid prototyping to evaluate augmented reality ideas at lower costs before full app development. The studio employs a unique 'designium method' that categorizes prototyping into three types, focusing on technical feasibility, concept expansion, and user experience evaluation. Their rapid prototyping service enables quick creation of functional AR prototypes, leveraging a wealth of reusable assets to support diverse applications in AR technology.