Art glass vase......Help!

I don't know enough about this type of art glass to even hazard a guess who made it. The signature on the bottom looks like Errisart? With 2004(a date?) and vclt on the bottom. It is HEAVY. 7" tall and 5" across at the widest point. What drew my eye was the swirled pattern of the top half over the spotted bottom. The juxtaposition of themes was jarring but seemed to work for this piece. Any help with ID would be appreciated.