I keep a box of Kliene Gernegroß blocks on my desk at work. The simple models provide a good distraction and decorate my desk well.
Here's a slight variation of the g_12 model.
Anchor Stones are small stone architectural building blocks made from quartz sand, chalk, and linseed oil. They are sold sequentially in sets with an instruction booklet of plans for various constructions. This is a repository of additional constructions that can be made.






Here's a GIF animation of the build in progress.