. The solar corona -- one of the most spectacular celestial shows and yet one of the most challenging puzzles - exhibits a spectrum of structures related to both the quiet Sun and active regions. In spite of dramatic differences in appearance and physical processes, all these structures share a common origin: they all related to the solar magnetic field. The origin of the field is beneath the turbulent convection zone, where the magnetic field is not a tsar but a slave, and one can wonder how much the coronal magnetic field "remembers" its dynamo origin. Surprisingly, it does. We will describe several observational phenomena that indicate a close relationship between coronal and sub-photospheric processes. Key words: Sun -- solar corona -- magnetic field -- helicity 1. Introduction The corona - a tenuous portion of the solar upper atmosphere - was observed as early as 1063 BC (Golub and Pasachoff 1997). The real surprise came in 1939, when Grotrian discovered that the cor...