You used to have a purple cat [Ei] that was lonely so you bought a little blue cat [Scarameow]. Ei taught Scarameow when to play, eat and sleep and all sorts of stuff.

Until the purple cat was too big and old that it cant really do much anymore till it eventually died. Scarameow was devastated and was depressed for weeks.. So you eventually bought another cat.

Scarameow taught the new cat everything he had learned from the purple cat, Ei. The blue cat isnt lonely anymore...