No text, but a visual code

[Jorge_Stolfi]

I believe the Voynich script was made with a Volvelle, a tool like the astrolabe that was used to make astronomical calculations. A Volvelle like this one for example

Thanks for that interesting image!  

When and where is that "built-in calculator" from?  (You surely know about Ramón LLull's "philosophical engine" wheels, right?)

However, I don't see how the VMS circles could have been created with such a device device.  On the contrary, a compass would have been necessary to create those computing wheels.

The VMS circles seem to have random radii, hardly two of them the same.  At their center there is usually a small pinprick such as could be created by the compass's dry point (and it is a thru-hole indeed, as can be seen in the backlighted images of f70v1 or You are not allowed to view links. Register or Login to view. from the multispectral set).  It is too small to have served as the axis of a rotating paper wheel.

All the best, --jorge