TULSA, Oklahoma - Mayfest rolls out its biggest piece of art ever for its 40th birthday. The downtown Tulsa arts festival made sure it's 3-D "wonder wall" is ready for Thursday.

And don't think you've seen it all.

"It's going to get longer each night, so even if you see it Thursday night, and it's four or five minutes long, you want to come Friday and Saturday night to check it out as well because it's gonna get longer, and better," said Heather Pingry of Mayfest.

The 3-D light show airs on the side of the 320 South Boston building between acts at Mayfest.

The progressive wonder wall has been done in Europe, on the east and west coasts, and as close as Dallas, but never before in Oklahoma.