  RR Lyrae stars for a long time had the reputation of being rather simple
pulsators, but the advent of high-precision space photometry has meanwhile
changed this picture dramatically. This article summarizes the results obtained
for two remarkable Blazhko RR Lyrae stars and discusses how our view of RR
Lyrae stars has changed since the availability of ultra-precise satellite
photometry as it is obtained by CoRoT and Kepler. Both stars, CoRoT 105288363
and V445 Lyrae, show a multitude of phenomena that were impossible to observe
from the ground, either because of the small amplitude of the effect, or
because uninterrupted long-term monitoring was required for a detection. Not
only was it found that strong and irregular cycle-to-cycle changes of the
Blazhko effect can occur, and that seemingly chaotic phenomena need to be
accounted for when modeling the Blazhko effect, but also a rich spectrum of
low-amplitude frequencies was detected in addition to the fundamental radial
pusation in RRab stars. The so-called period doubling phenomenon, higher radial
overtones and possibly also non-radial modes make RR Lyrae stars more
multifaceted than previously thought. This article presents the various aspects
of irregularity of the Blazhko effect, questioning its long-standing definition
as a "periodic modulation", and also discusses the low-amplitude pulsation
signatures that had been hidden in the noise of observations for centuries.
