I was fascinated and thought how useful this could be for the sight impaired.
As the pen is pulled over the page, a spindle unwinds wool which is drawn out and sticks itself to the velcro surface. This creates a tactile drawing that is 'feelable' to those who don't see well. The uses are numerous and beyond just art. For example, as shown on the video clip, cursive writing can be created, geometry shapes and other maths too.
And it's just made of wood!
Here is the link to their 'Start some Good' crowdfunding page.
There are only nine days to go for them to reach their target.