My first encounter with ‘apocalyptic riders’ happened some 40+ years ago when i had to study a Hans Memling  painting for a school project.  I  read the full Book of Revelation by St-John and could observe how full of detail Memling’s paintings are including those four riders but i also noticed how incomprehensible and therefore unimportant these revelations are….  That painting is on display close to where these sculptures stand.  Highly recommended pieces of art, both!