Shed roof, revisited

The cycle shed roof at Ewell West looked very well this morning, just after a sharp shower. It has come on a lot since I lasted snapped it, getting on for two months ago. See reference 1.

PS: I mentioned artefacts of image processing in the last post. And here we have another: click to enlarge and the diagonal patterning on the right hand side of the shed vanishes to reveals the planks themselves. A robust artefact, as you get the same thing on a mobile phone, or at least on my mobile phone. Is it what is known in the trade as a moiré effect or is it something else altogether?

Reference 1: http://psmv3.blogspot.co.uk/2018/04/shed-roof.html.