Although I've not come across the term before:
I believe it's likely to mean a display wall, showing a collage of their creative achievements in the various media they cover. It would also, effectively, show the areas that they may wish to develop further.
Hope this helps.
PS: It's somewhat similar to the TV homicide detectives who put the names of all those potentially involved on a wall and identify, alongside them, their relationship to the crime, the victim and the crime scene. It makes it easier to visualise the connections and the "big picture".
Student or Learner