User blog comment:JmLyan/Phaze, the Extradimensional/@comment-5686533-20150605141502/@comment-7481207-20150605153356

Basically, the rift will look something like this: http://gyazo.com/640bd2ce1697744367d6f235e32b32d6

It can have any angle, so if you were standing in one mid lane brush and facing the other, it would cross the midlane from nexus to nexus.