  A historical review of spin- and angle-resolved photoemission on topological
materials is presented, aimed at readers who are new to the field or who wish
to obtain an overview of the activities in the field. The main focus lies on
topological insulators, but also Weyl and other semimetals will be discussed.
Further it will be explained why the measured spin polarisation from a spin
polarised state should always add up to 100% and how spin interference effects
influence the measured spin texture.
