******MANY SPECIES OF SPOILERS!****** From the mind of 30-year old Latvian filmmaker (and composer) Gints Zilbalodis and cowritten by Matīss Kaža, “Flow” (aka “Straume”) is a genuine passion project. Made using free online Blender software, the movie has an expensive, rotoscoped look to it. With no dialogue–let alone humans–“Flow” has a unique soundscape of real…