I do not consider these to be inside-outs, although I suppose some others might. There is no definition written down anywhere.
I consider inside-outs to be the thin ones, sometimes with the prunt on just a teal body with an inside layer of frothy yellow, if later.
These Tiger ball vases are post-Harris, the design by Eric Dobson and are really lovely incredibly thick lumps of glass.
Not that common, but I do have three of them. I like Tiger - but not the later much flatter Marble with the pale background.
Some might, I suppose, consider them to be "paperweight vases".
Theya re actually a good bit bigger than proper inside-outs.