While the Sun appears relatively uniform in visible light, it presents its complex magnetic nature and esthetic beauty in X-rays. Of particular interest in terms of physics is the region governed by the intimate interaction between magnetic field and plasma. This magnetic transition, located a few 1000 km above the solar surface, is the prime topic of the space-based solar observatory IRIS (Interface Region Imaging Spectrograph
). Here some results will be reported that present us with a new, more complex view of the atmosphere of the Sun and that pose a variety of new questions.