How do you hide the screw holes?

The site is unknown at the time of perceiving this target, but it is related to Helene Grimaud’s project to play the piano in a water-filled structure, where music will bounce off between the arched metallic ceiling and the water surface that had to be absolutely level.

So, [A] is my father [archetype of facilities construction inspector role] sitting on a man-made wood pile of the compressed board and a worker approaches him [B] but he is eating a cake rather than  working. My father, then jumps off the wood pile and climbs up like a monkey without safety equipment to inspect metallic piping already installed but not functioning yet. The work practice felt unsafe! My father then discovered a jackknife with various size marking tools. 
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When new information was released on this project I discovered the site, and the engineering involved to create such an environment. Very interesting to say the least.
 12/10/2013

So it can also be used as roofing material? The website only mentions it being used as underlayment, not as the finishing layer. I love the look of the product and are considering it for some renovation work I am planning. Already decided to use it as flooring, considering it for the facade and the shower.

Fantástico.