The slight budgeted but densely scripted sci-fi film Primer was praised for the truthful physics, potent technicality and unadulterated complexity with which it treated its core treatise of time travel. Having heard this hype Primer was a film that I quickly became excited for and while I eventually respected the result it turns out that those traits are not what I most look for in a movie and so the picture was one that I could never quite care for like so many fans do. For me it was an amazing visualization of a chapter in some cool textbook more than it was a living, breathing movie. Now, nine odd years later, comes the follow-up, the second feature from Primer auteur Shane Carruth; the intriguingly titled Upstream Color. Given our history my hopes for it were lower, and maybe that helped, but boy did I love the result; a film as frenetic and feeling as it is funly frustrating to figure out.