Crystal balls
The mysterious Derek Hill just has to let us know where to find a higher resolution version of this wonderful image – I want it for a PowerPoint slide background! From Seth Godin’s blog.
Keith Peter Burnett’s blog about Maths teaching and ILT
The mysterious Derek Hill just has to let us know where to find a higher resolution version of this wonderful image – I want it for a PowerPoint slide background! From Seth Godin’s blog.