Josef Gatti tells us little that we don’t already know in “Phenomena,” and that’s pretty much the point. In his first feature-length documentary, the Australian takes a seductive, hyper-sensory approach to the kind of educational filmmaking that any sixth-grade science teacher would be glad to use as a classroom aid — and in so doing, makes fundamental facts of the universe seem once more beguilingly mysterious to us. Using a combination of simple home experiments and intricate analog