Deliberate or accidental. There seem to be quite a few people in the "this is no accident camp," but then again, accidents do happen with simple geometric shapes.
The shape is certainly there, although you have to ignore the rear walkway, and the walkways that go through the entry and exits. Here I've perspective corrected the above image.
It seems rather implausible that this would be a deliberate design choice approved by the CPAC organizing team. Maybe someone slipped it past them? Maybe a coincidence? Or simply plausibly deniable?