I think KaliDurga is more correct on how to interpret "Look Alive". Brandon's saying pay attention - life is fast. I think the sunglasses/looking at feet line is pointing out how we try to act cool and nonchalant in the face of the mystery of life and that by doing so we are passing by the opportunity to see ("The camera lens is opening ") the wider picture/perspective which is all of ours to enjoy if we avail ourselves of it ("The wider angle's yours ").
I think KaliDurga is more correct on how to interpret "Look Alive". Brandon's saying pay attention - life is fast. I think the sunglasses/looking at feet line is pointing out how we try to act cool and nonchalant in the face of the mystery of life and that by doing so we are passing by the opportunity to see ("The camera lens is opening ") the wider picture/perspective which is all of ours to enjoy if we avail ourselves of it ("The wider angle's yours ").