Marty Jopson of The One Show got the Festival off to a flying start, followed next day by a highly dynamic show on the science of everyday life.
The sea surged through the Festival, in a year when the world looked back a century to the battle of Jutland and forward to the potential of tidal power.
You could find out about living in space, or operate a robot arm. You could make a noisy drawing or a porridge poultice, an ancient animal or a modern molecule.
The window of a former Orkney clothing shop is back in action with costumes this week. Aislin, Nyx, Nehalennia and Calypso were specially created for the Year of Innovation, Architecture and Design.