It's the gesture that gets you. Mass murder is commonplace, happens every day. Memorials from said murders are even more common. But no, it's the way she built it and didn't tell you, in your own garden. The way she hid it behind the overgrown bushes and left it for you to find. The fact that she must've left flowers every day from the sheer numbers of rotting picked flowers, from your own garden, and you never knew it. Ginny was always a thoughtful child, but this had to be deliberate. She did it the way they would've done, callously taking the fruits of your labor, and making it so you can't help but love them for it. And you do love them for it, not her, them. A monument to your twins in the back of your garden, hidden from your view for little over a year now. You would thank Ginny, but she's gone now, lost to Tom. And now you don't know what to do, after years of cursing her memory, because you couldn't bear the thought she'd outlived your heroes. Of course she left this, just before she left you. She always was a thoughtful child.