How do you know on a safari that you have a creative block? When you get grumpy, impatient, unsatisfied, complaining and restless on the safari vehicle. It is, because you think there is nothing interesting to see and photograph. You feel disappointed, because the bush is not showing you something interesting. But it only means that you have a block. For some reason you don’t see, for some reason you are not able to identify interesting things all around you.
When you realize you have a block, its already almost over, because you identified the problem. Now solve it. Take a break, do something completely different, like lying on the lodge pool and read a book or just have a nap. Let go and the block will go too.