A bouwsteen (=building block) is any stone/brick whatever that you can build with. A baksteen is a bouwsteen but a bouwsteen is not always a baksteen. What you show on the photograph are bakstenen used as bouwstenen. A tichel is something mentioned in the Bible and impossible to use in wet Holland: it is something used in the Middle East made of mud and straw and merely dried in the sun. Jcwf (g · b · a)

Li ser bouwsteen gotûbêjekê bide destpêkirin

Gotûbêjekê bide destpêkirin
Vegere rûpela "bouwsteen".