Mug with an oak tree motif. The pattern is all over the mug. Oak is a sacred tree for most Indo-European nations, including Germanic tribes, Celts, and Slavs. It is often dedicated to the god Thunder Lord - to the Slavic Perun, to the Germanic Thor (Donar) and to the Celtic Taranis. The mug was made by Mr. Kučera, decorating before firing is our job.