Each “app” is made up of separate square templates cut out of a white-board material. They cut the pieces with a jigsaw. Each panel is hung from above on a suspended horizontal black pipe. Individually each panel is connected together by white chain links that they cut to make a C-shape so that they could connect each square together.
The cross in the center was created by flipping over the white squares to display the brown back. What a simple and inexpensive stage design working really well for their small stage.