to a particular compositional grid gives a sense of certainty that the thing will sit well within the clearspace designated for it.
I think they can silkscreen on just about anything. They do require a file that can stand up to the requirements of their screen printing, though. Print images have their specific process; line art substitutes for gradated tone in silkscreen production.
The original, digital file of the oval's design was also used for signage fabrication at the shop here in Wilmington.