Easing are complicated algorithms, depending on what has been selected in the Animation, as the easing applies to all parts of the animation.
Experiment with and enjoy.
Don't forget you can apply one, two or more styles to a Style through multiple widgets to make different things happen at the same time.
For example style 1 spins clockwise repeatedly, this would be a linear ease.
Secondly you wanted to give it a shrinking/growing appearance like it was arriving & disappearing and it accelerates towards as it gets bigger, this would be a second style, with a EaseInCirc