Perfect white studio

Today I tried to get a perfect white background by using some white cards.  I must admit I did not fully succeed, but it got really close with only about half an hour of positioning the cards.  Some Photoshop whitening did the trick ;)

The thing is you need a smooth transition between the horizonal and vertical white area's.  Ideally this is just one and the same field.  I used a few white cards to bounce off the flash to avoid too strong shadows.

Enjoy.