Boulder Stacks are available in Small, Medium and Large and can be made to suit your requirements.
There is also a Table Top version mounted onto an oak plinth for sitting on a shelf or window sill.

Inspired by the internationally renowned artist Andy Goldsworthy, I have used his work with balanced stones as inspiration for permanent garden sculptures. Boulders and pebbles (credibly sourced) are drilled and threaded on to reinforced steel bars to create a stable yet surreal addition to gardens or interior decor. Each piece is unique by geology and will give year round architectural interest to a garden, patio or conservatory. Boulder stacks can be easily moved to a new location because they are supplied with either a steel bar to stake into the ground, or a base plate welded to the bar for paved areas.