Now I know why my husband saw it three times in four days! Imax 3D version totally puts you into the action. Found it hard to return to Earth afterwards. Best idea was the interconnected trees with more connections (synapses) than a human brain. Plants are connected like that here on Earth as well. And when you add all the living organisms in the soil that closely interact with roots, you've quite a web. Felling forests and digging big holes has impacts here that we have yet to appreciate. Environmental messages aside, the action and effects were great. A few moments of disbelief when the hero was in his human body in daytime when he shouldn't have been, but that was relatively small dissonance.