Not yet seen variable fillet but not all seen :)
videos without sound
Arche
http://www.youtube.com/watch?v=DZc_fj8xJOc

Guitare
http://www.youtube.com/watch?v=QcFX3IcAk3M

Chair
http://www.youtube.com/watch?v=jGYPrEfG4no&feature=related