Thanks again for the help. Expressions are really powerful.
The first expression gives me a dimension error message.
The second expression provides a very nice, natural feeling bounce back and is a significant improvement over my efforts but how can I gradually scale the illustration over time (indicating a build up of stress) and then have it bounce into its normal shape? It would also be useful if the effect only stretched horizontally as that would allow me to use it with text (RESILIENCE) later in the program.