Last Updated: Nov 02, 2016 Views: 22
I asked our Curator of Contemporary Glass about registering artworks. She said it's important to have the registration card, especially if you want to sell the piece at some point, but she doesn't believe you need to register the piece. "If it has a serial number on it, that should be enough with the card."
You might be interested in this Q&A from another owner of a Paul Manners sculpture. Manners replied with some information about his career in the comments section.