这个叫Tetrius的彩色俄罗斯磁块虽然不会自动掉下，但你至少可在冰箱或白板上做一些更有趣的事，10美刀：

Tetrius magnet set includes seven figures each built of four squares.

The magnets can stick to your fridge, an office whiteboard (TaskWatch holds them just fine) or any other metal surface.