Preservation Door

According to the S.S. Dolphin II, this object provides memory storage for computers. But the more that such devices remember for me, the more I'll forget everything. This idea frightens me.

Fortunately, the S.S. Dolphin II is wrong about what this object is. It's a door without a knob. Now there's something useful—a family could stay safe in their house if no one could get inside!