Kurt Cobain woulda loved that pipe 
About the Jack pipe. I never had one so letās keep it clear that in this case Iām an absolute armchair specialist. But it seems to me that the ādouble venturi double vortex barrel ricochetā thing is a whole lotta fancy words to make something more easily marketable among stoners who the bulk of probably donāt even properly know what a Venturi valve or effect actually is.
I wonāt say thereās not a venturi action going on in this pipe. But I will say that by that same principle, every bong has a venturi action going on in the downstem. Because all āventure principleā really means is the fact that a reduction in diameter will cause a higher speed of the product being transfered through that diameter. This causes a local diminished pressure, which in Venturi valves is used to suck in a stream from a secondary source.
Basically a venture valve looks kinda like this: ===>āā--<=== with the ā being the smaller diameter part and the ā being the secondary source that is pulled into the main stream ====
I struggle to find the ricochet part. And I also struggle to find the vortex part feasible, assuming the bores are both a simple straight bore.