The missing design is part of A Herd Day's Night
The hunt is on for a mini Superlambanana sculpture which was taken from Liverpool city centre.
The Superlambanana was one of several decorated as a workman in a hard hat and fluorescent jacket as part of the Capital of Culture celebrations.
It had been screwed down next to its mother outside Maghull Developments on Hope Street, but vanished on Sunday.
More than 100 specially-decorated replicas of the iconic sculpture are currently on show.
The missing sculpture is one of a group called A Herd Day's Night.
Jonathan Sealey, a surveyor at Maghull Developments, said they wanted it back.
"We left work on Friday afternoon and there were two Superlambananas which had been screwed down outside our office, so they couldn't be taken - or so we thought," he said.
"When we came back on Monday morning, there were just the four brackets left with no little Superlambanana attached."
About 125 replicas of the yellow sculpture made by Japanese artist Taro Cheizo have been placed around the city centre and suburbs.
They have been decorated by artists, schools and community groups and will be on display over the next 10 weeks as part of public art project Go Superlambananas.
Trail maps have been made so people can see all the sculptures that look like a cross between a lamb and a banana.