LEGO sets are becoming increasingly complex, but they may be inspiring less creativity.

Canterbury University researchers have analysed nearly 11,000 LEGO sets produced between 1955 and 2015.

They found sets have become bigger, more colourful and more specialised.

But Associate Professor Christoph Bartneck said the increased complexity could also have a downside.

"Children essentially are less encouraged to take the LEGO model apart and build something else."

Bartneck said the complexity of modern sets means children are often only encouraged to build models according to instructions.

"Having the ability to build things yourself from your own imagination, I think that is definitely decreasing."

The researchers hope to see more encouragement towards originality and creativity with designs.

Last year, LEGO released their biggest model ever - a model of Star Wars' Millennium Falcon, with over 7,500 pieces.