What is Master’s Obra and why use it for the website? AKA Master’s Work, masterpiece, magnum opus, chef-d’ceuver, As a Christian believer I see the work of God in these family trees. To me He is the Maestro de Obra (Master Builder). This website is a just an exceedingly small portion of His work. Even when there is brokenness and strife that enters the tree… He can prune, heal, and graft. Yes, I researched and developed the website, but I am no master. Chances are if you really look there are many typos and data entry errors. Please let me know when there are.