Tubes, from Vistosi,is tubes, but square ones! They can be employed in a variety of ways to make compositions, including attached directly to the ceiling, as above.
You can see below how they are normally mounted, with a visible metal structure:
and here, where they are mounted individually, rather than in clusters:
However, Tubes have also been mounted directly to the ceiling. This is the Crowne Plaza in Dubai:
Or they can be suspended, as here, in a publicity shot from IFI for Beverly, one of their cool (in both senses of the word!) counters for bars, gelaterie and pasticcerie:
As standard, the glass is either polished white or semitransparent fumé.
The images in this post have been taken from the book Vistosi have just published that shows details of some of their installations. You can download a PDF of it here.