I made a small search on youtube to see some videos related to turning a sphere inside out. Please have a look at this gem : http://www.youtube.com/watch?v=R_w4

I made a small search on youtube to see some videos related to turning a sphere inside out. Please have a look at this gem : http://www.youtube.com/watch?v=R_w4HYXuo9M# http://www.youtube.com/watch?v=R_w4HYXuo9M# Especially the snelpiller's comment