On November 11 2011, the £5 million Polaris instrument was installed at ISIS. Since we happened to be doing this major activity on the same day as the One Day on Earth project, we decided to make this our contribution to the project. Installing the instrument was the grand finale of more than 4 years of design and manufacture and new science results are expected very soon. The instrument measures the locations of atoms in materials that are being newly developed or in daily use.We call it a supermicroscope. The ISIS Neutron and Muon Source is located at the Rutherford Appleton Laboratory, Oxfordshire.