A Pensieve is an instrument (or tool) used to collect memories or thoughts. Even once a person is dead you can look at their memories. We worked a lot on pensieves over my extra lessons with him and even though I preferred to offer him a look at a specific memory I now keep some in a pensieve. I would just like to take a moment and look at the best and worst memories of some of the people I know.

Louisa Snape-Riddle: I can hardly divulge other’s memories when mine are nowhere to be seen. Well nowhere to be seen is quite an adequate statement but I will give you what I know, what I remember.

My worst…the one that wakes me up at night… is standing on the stairs, I was two. I walk down the stairs to the books and window and there is a flash of green light. I wait frozen on the spot, the man looks around and leaves. This is when my mother was killed my Lucias Malfoy.

My best…? Being on a beach. And realising that the person I want to be with is sitting next to me.
There are lots of memories, good and bad and you are hearing so many now, in all my books