  The interference of matter waves is one of the intriguing features of quantum
mechanics that has impressed researchers and laymen since it was first
suggested almost a century ago. Nowadays, attosecond science tools allow us to
utilize it in order to extract valuable information from electron wavepackets.
Intense laser fields are routinely employed to create electron wave packets and
control their motion with sub-femtosecond and sub-nanometer precision. In this
perspective article, we discuss some of the peculiarities of intense
light-matter interaction. We review some of the most important techniques used
in attosecond imaging, namely photoelectron holography and laser-induced
electron diffraction. We attempt to ask and answer a few questions that do not
get asked very often. For example, if we are interested in position space
information, why are measurements carried out in momentum space? How to
accurately retrieve photoelecron spactra from the numerical solution of the
time-dependent Schr\"odinger equation? And, what causes the different coherence
properties of high-harmonic generation and above-threshold ionization?
