Frame by frame gets pretty tricky. I recently got a part time job (Working for an Elevator Inspection Certification Company, yeah!) so the 8 hour animation days have been more like 2 or 3. I spent the last week or so working on this water effect pictured above. The image shows the outline of every shape in the water sequence, about 200 in all. It's a 5 second sequence in the animation, but at least it looks awesome!