Comparison between scatter and density plots when trying to visualize the sky as observed by Gaia DR1. Top left: a scatter plot showing 10 000 sources in Equatorial coordinates, which does reveal some structure in the disk. Top right: idem, with 1 000 000 sources, hiding almost any structure present in the data. Bottom: a density plot with 1 142 679 769 sources, where the logarithm of the density is colour-mapped (black is low density and white is high density). This reveals much more features in the data, such as structure in the disk and artefacts related to the scanning nature of the Gaia satellite.