Learn Turkish: Ahşap böyle pürüzsüz görünmüyor. - The wood doesn't look smooth like this.

We use böyle because it refers to something close to the speaker or something they are demonstrating right now ('like this'). If the speaker were talking about wood they saw earlier or further away, they would use öyle ('like that').

Does böyle describe the wood or the smoothness?

Here, it describes the smoothness (pürüzsüz), meaning 'smooth like this' or 'this smooth'. If we moved it to the very beginning (Böyle ahşap...), it would describe the wood, changing the meaning to 'This kind of wood doesn't look smooth.'

What is the suffix -süz doing in pürüzsüz?

It is the Turkish equivalent of the English suffix '-less' or 'without'. Pürüz means a flaw, roughness, or unevenness, so pürüzsüz literally means 'without roughness,' which we translate as 'smooth.'

Why is the verb görünmüyor and not just görmüyor?

Görmek means 'to see.' Adding the -ün suffix changes it to görünmek, which means 'to be seen,' 'to appear,' or 'to look.' If you said görmüyor, you would literally be saying that the wood cannot see!