Why sequences? Well, they're a good and automatic way to show something changing, pictorially, over time. String the images together and you've got a so-called 'time-lapse' video. In the example below I was trying out the idea on a bus journey into town, but it could equally well be your garden - or the setting up of an event - or a landscape, in each case animating a much longer period of time. For example, the bus journey was 15 minutes and the video takes only 20 seconds.