If you pass by the library of TU Wien in the evening from 5 pm to 11 pm, please take a look at the owl. You will see various projections with topics from TU Wien. If you look carefully, you will see extragalactic radio sources (provided by David Mayer) and the M2 tide in the oceans (provided by Michael Schindelegger). The projections are up until 9 December 2017, celebrating the 30th anniversary of that building. More information about the figures are provided here.