Not really a container. By 'column' I mean it was a pillar. A hollow glass pillar with dirt packed inside. There were several of them and the entire room was surrounded by dirt too. All glass except for a wardrobe dug out at the back.

[ He watches her press a hand to the mirror, nervous but also eager to hear whether she gets a reading from it. What if it's a bad memory? Kaito feels guilty whenever he brings her something like that. ]

...Anything?