This tricycle designed for children by Vietnamese firm a21studio has been crafted from bamboo and finished with ropes. 

a21studio used bamboo to form the frame because it is a versatile, solid, and sustainable material abundantly available in Vietnam.

The tricycle has been locked together with bolts that are also fashioned from bamboo, which have then been covered by rope. It has not been exposed to chemical treatments so will weather and decay over time.

The rope securing the bamboo bolts can be loosened, encouraging children to modify or re-design the tricycle.

"By designing this bike with materials, which can be easily found everywhere, we hope not only to bring true happiness to children but also remind us about our childhood," say the designers.

We've featured a number of projects that utilise bamboo in a variety of ways, including a riverside cafe supported by fifteen conical bamboo columns, a pop-up bamboo theatre, and hand-made bamboo lamps.

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Here's some more information from the designers:

The tricycle is a long story attached to each child’s memories. It is interesting to see village children playing with bamboo bikes. The simplicity of the vehicles and happiness of children are the inspirations of this design.

Made by bamboo with wooden wheels, which are popular materials in Vietnam, the tricycle is threated with care in every detail without any chemical treatments. The bike may be decayed with time but the kids will learn showing consideration for its nature. Moreover, all the parts are linked by bamboo bolts and then covered by ropes so that kids would be excited to assemble and repair the bikes themselves or modify the design to their needs.

By designing this bike with materials, which can be easily found everywhere, we hope to not only bring true happiness to children but also remind us about our childhood.