F#1-13 is a collection of photographs, sculptures, wind barbs and texts around a gridded flag that blew for thirty-nine days in Citadel Park, Ghent (Belgium). The flag was photographed every third day. A wind sensor, attached to the flagpole, measured the wind direction and speed. The results of the measurements – taken at the same instant as the photographs – were plotted out using wind-barbs. Texts were written based on phenomena, dialogues, manuals, revelations and data along the side-lines of the process of capturing the flag. The uppercase, italicized and sans serif F in the title of this book refers to a north-northeasterly wind of 20 knots coming from the direction of the flag and passing exactly between two nearby museums. This book is made with the kind support of the Cultural Department of the City of Ghent, School Of Arts/KASK, Ghent and Smoke & Dust/019.