Conversation so far:
Where does Celtic art come from?
Celtic art is associated with the peoples known as Celts.
What are the influences?
Archaeologists identified various cultural traits of these peoples, including styles of art, and traced the culture to the earlier Hallstatt culture.
What was the Hallstatt culture?
CANNOTANSWER.
What are popular pieces of Celtic Art?
CANNOTANSWER.
Are there any other interesting aspects about this article?
The term "Celt" was used in classical times as a synonym for the Gauls (Keltoi, Celtae).
What does the word mean?
The ancient peoples now called "Celts" spoke a group of languages that had a common origin in the Indo-European language known as Common Celtic or Proto-Celtic.
What time period is this?
pre-history through to the modern period.
What did you find interesting in this article?
Ireland.
Then in the 18th century the interest in "primitivism", which led to the idea of the "noble savage", brought a wave of enthusiasm for all things Celtic.

Question: Where else does Celtic art come from?
Self-contained rewrite: Where else does Celtic art come from, aside from the ancient people now called "Celts"?