Protonema baseboards distribute power to stamps, and physically anchor them together.
Three baseboards are currently designed:
The primary baseboard design is designed around a 8 1/2" by 11" paper size, which allows Protonema projects to be stored in a standard three-ring binder. It allows twelve 1x1 stamps to be attached. There is also a carrying handle, and a place for labels.
This half-sized baseboard is more compact, and allows six 1x1 stamps to be attached.
This mini baseboard allows four 1x1 stamps to be attached.