Mrs Brett said she shut down for 12 weeks during coronavirus and the closure presented the perfect opportunity for Katoomba artist Nastia Gladushchenko to paint the mural on the side of The Sonic building.

"It's all based on native botanics found in the Orange area, the mural is called Sonic Bloom," she said.

"We just gave her a colour pallet for her to work with and she came up with the design.

"It's been so lovely having everyone out there watching her do it."

The mural was started on Monday and finished on Friday.

Mrs Brett recently reopened Jumbled and The Sonic building and said the mural colours of orange, pink, mustard, yellow, red and a splash of cobalt blue were in line with the new collection.

The mural can be seen from the side when approaching the building along Sale Street next to the car park.

Mrs Brett said the feed back has been positive, a five-year-old girl wanted to help paint and a couple asked to have a wedding photo taken outside of it on Friday afternoon.

"I think we should do this everywhere around Orange, it's nice to transform an ordinary wall," she said.

Ms Gladushchenko has been painting murals for three years and said the 80 square metre mural is the biggest one she's done and she used a boom lift to complete it.

"They posted about it on Instagram and I saw it and reached out because I love their store and I was looking for an excuse to come and visit Orange," she said.

Ms Gladushchenko's previous biggest mural was 50 square metres and required the use of a scissor lift.

"It has been a bit harder to manage the scale issues, you have to scale the size, it's a bit more fun for me because I get to see it on such a large scale," she said.

'"I'm a trained interior architect so I always loved spaces and the built environment and in terms of mural painting I started by designing one and someone else painted it."

She said the rest came down to practice and she started the design as a digital artwork and used a grid system to transfer it to the wall.

"I had an assistant helping me for two days, if I hadn't had her it would have taken me seven days on my own," Ms Gladushchenko said.

Her next work will be another native flora design that has been commissioned by the Inner West Council but a building is yet to be confirmed.