"Basheer Graphic Books would like to promote Pantone color guide book to art college students and faculty, and to convince them that Pantone has the most color selection for their printing guidance. To grab their attention, we re-create a rainbow consist of Pantone color chips in the middle of college’s park. With 8 meter in length and height of 4,5 meter, more than 5000 different color chips were used to cover the arch. The rainbow creates a spectacle and students realize that Pantone has real life colors. Inquiries for Pantone books in Basheer Graphic Books also signicantly increase."
See the Pantone Rainbow with 5000 different (!!) Pantone color chips glued onto wood boards here