Walkers venturing into Lang Crags near Dumbarton have been puzzled by the appearance of some bizarre artworks.

The eccentric objects included a switch for a pedestrian crossing, a large empty frame, and a kelpie, the legendary water spirit said to inhabit Scotland's lochs and pools.

They were among 16 pieces of outdoor art installed at the Woodland Trust Scotland site by third year sculpture and environmental art students from The Glasgow School of Art.

The trust's George Anderson said: “We have been hosting annual exhibitions by Glasgow School of Art students for several years and it always adds extra interest for anyone having a walk round the woods.

"The work is always varied but we love that it often speaks to the location or has an environmental message."

Student Myra Rose, who designed the crossing, said: “Pedestrian buttons are implemented for an illusion of control and more often than not are placebos.

"As modern-day autonomous agents we are reminded to stop, look and listen.”

The frame was installed by Nancy Collins, who said she wanted to challenge the way people looked at landscape.

She added: "The frame is a tool to focus in on particular move­ments, colours or compositions in the environment.

"Often we only view landscapes through a frame whether that is a painting or a film.

"By bringing the frame into the landscape the viewer is encouraged to be present and connected while looking.

"It allows a comparison between the details ‘framed’ and the contextual surroundings."

Meanwhile, Erin Hephzibah said of the kelpie sculpture: "The extinction of folklore is a comment on folklore in modern culture.

She asks: "Al­though still a popular and studied part of our history, does modernity stop the creation of new folklore?

"My interest in this topic has inspired me to create the remains of a crea­ture so well known in Scottish folklore, the Kelpie.

"By creating a skeleton I want to capture the imagination of the audience, the same way fossils and skeletons of dinosaurs do to so many around the world, by inviting them to explore a lost world of monsters that our ancestors would have feared.”

A closing event was held on Friday at Overtoun House in Dumbarton to mark the end of the project.

Lang Craigs is a mix of ancient woodland and sheltered glens, offering hiking, fascinating flora, an abundance of wildlife and stunning views of the Clyde, Dumbarton Rock and Ben Lomond.