- To add static content to the stage use "add frame" or F5
- To animate content on the stage use "add keyframe" or F6
The green square is sitting in a frame and will remain stationary in the frame until the playhead passes the end of the frame @70.
A typical layer structure for an animated sequence for Task 3 could look like this.
Some notes on the beginnings of modern animation
"Steamboat Willie is especially notable for being the first Disney cartoon with synchronized sound, including character sounds and a musical score. Disney understood from early on that synchronized sound was the future of film. It was the first cartoon to feature a fully post-produced soundtrack which distinguished it from earlier sound cartoons such as Inkwell Studios' Song Car-Tunes (1924–1927) and Van Beuren Studios' Dinner Time (1928). Steamboat Willie became the most popular cartoon of its day................"
........."Steamboat Willie was not the first cartoon with synchronized sound. Starting in May 1924 and continuing through September 1926, Dave and Max Fleischer's Inkwell Studios produced 19 sound cartoons, part of the Song Car-Tunes series, using the Phonofilm sound-on-film process. However, the Song Car-Tunes failed to keep the sound fully synchronized, while Steamboat Willie was produced using a click track to keep the musicians on the beat. As little as one month before Steamboat Willie was released, Paul Terry released 'Dinner Time' which also used a soundtrack, but Dinner Time was not a financial success." @ https://en.wikipedia.org/wiki/Steamboat_Willie
Max and Dave Fleischman
...."Rotoscoping, the process of tracing animation drawings from live-action footage, was used minimally to lend realism to the character's bodily movements. Many of Superman's actions, however, could not be rotoscoped (such as flying, lifting very large objects, etc.). In these cases, the Fleischers' lead animators—many of whom lacked training in figure drawing—animated "roughly" and depended upon their assistants (many of whom were inexperienced animators, but trained figure-drawers) to keep Superman "on model" during his action sequences...."
."...The Fleischer cartoons were also responsible for giving Superman perhaps his most singular superpower: flight. When the Fleischers started work on the series, in the comic books, Superman could only leap from place to place (hence the classic phrase, "able to leap tall buildings in a single bound"). After seeing the leaping fully animated, however, the Fleischers deemed it "silly looking", and asked Action Comics' (which would later become DC Comics) permission to have him fly instead; the publisher agreed, and wrote the flight ability into the comics from then on. @https://en.wikipedia.org/wiki/Superman_(1940s_cartoons)