Interesting origin to this style of glass. The idea came from Henry Moore sculptures, which was popular with some Murano designers. They adopted the style for glass, calling it forato, so you can see some classic designs from the 50's that show this feature. It's also been copied by other makers in other countries making it difficult to attribute accurately without the presence of other features. This looks like fairly decent glass (I'm assuming it's heavy), but I couldn't say it's defintitely Murano or give you a maker.
Hope this helps get started and good luck.
David