Conversation so far:
What is the Migration Period art animal style?
Animal style art is an approach to decoration found in  the barbarian art of the Migration Period, characterized by its emphasis on animal motifs.
What animal is mentoned in the animal style Wikipedia article?
Steppe jewellery features various animals including stags, cats, birds, horses, bears, wolves and mythical beasts.
After bear what other animals are mentioned in the animal style Wikipedia article?
Bears, wolves and mythical beasts.
How many styles of Migration Period art were classified?
Three styles dominate Germanic art. The polychrome style originated with the Goths. The animal style was found in Scandinavia. Finally there was Insular art or the Hiberno-Saxon style.

Question: What happened in 1904?
Self-contained rewrite: What happened involving Migration Period art in 1904?