Newton's cradle has enjoyed a fantastic run as the go-to distraction toy in offices around the world. But today it's officially dethroned by this hypnotic ferrofluid flask that's basically magnetic magic in a bottle.

Usually reserved for science centre demonstrations, ferrofluid is a magnetic liquid composed of microscopic iron particles that form three dimensional shapes and patterns in the presence of a magnetic field. It's like that infant school iron filing magnetic experiment cranked to eleven. And for just £25 you can get your hands on a glob of ferrofluid sealed in a small glass bottle complete with tiny magnets for conducting your own experiments. Just don't expect to meet any deadlines or get anything done the day it arrives.

Here's the Best Desk Toy Since Newton's Cradle

[ThinkGeek]