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The FESTIVAL composite images are made of superimposed layers, very much like what you may be used to with Photoshop. One layer is associated with each instrument: one layer for EUVI, one for COR1, one for COR2, etc. Additional layers are used to display additional information on top of the images, like coordinate grids, labels, etc. A layer can contain either a 2D textured polygon, or 2D vector data. Textured polygons are used to display images, while vectors are used for grids and labels. The display order of the layers associated with the instruments can be modified. The other layers are always on top of the instrument layers. The visibility of the layers can be switched on and off.