Even in miniscule doses, animation makes such a difference in how things are perceived.
@jacobian introduced me to the following lovely gif:
Then @bitprophet, on IRC:
I need to make a version of that which says "no, YOU'RE awesome" ;)
Um.
And it serves as a great example for the animation stuff. I'll keep it brief.
We’re sensitive to the tiniest amount of animation. Often, that's all you really want—the minimum perceptible thing. Any more is too noticable, because your users will be seeing this animation over, and over, (and over), and over again.
How little animation can we still feel? Compare the addition of the "no" in both images:
The transition is all of one frame, sanwiched between the 100% invisible (startpoint) and 100% visible (endpoint). It's 50% opaque, and it appears for all of 0.05 seconds.
Sometimes, that's all it takes for something to not feel like a lightswitch.