This vortex is massively HUGE!! For any marble over 4", you really have to hold it in hand just too appreciate how massive it really is. The vortextual effect in such a large marble is just soooo impressive, and those lines and dichro spiral so far down in there! The lines are super tight, and this is one impressive marble to behold! The last pic shows you a size reference - this jumbo vortex makes a 1 1/2" marble look teensy! Signed Vogelpohl 2004.