Isunoki is a contemporary multipurpose facility completed in 2009, designed by architect Masanori Saito. Located in Marugame, Kagawa Prefecture, this innovative structure seamlessly integrates diverse functions including a botanical garden, aquarium, exhibition spaces, and commercial areas alongside administrative offices. The building demonstrates thoughtful architectural planning that accommodates multiple uses while maintaining coherent design principles. Saito's approach creates a dynamic space that serves both educational and commercial purposes, making it a notable example of functional modern architecture that responds to the complex needs of contemporary public facilities in Japan.