If transient-perfect only were that easy

[system7]

....However, we can also imagine a world where exactly the same snapshot has apparently appeared from the future...filter that arrives at its steady state response before the input has been applied...

Well, I use CDs made of Thiotimoline. They play before I even put them in my CD player.

Thiotimoline was invented by Isaac Asimov, so you can be sure it's true. 😀