How do seashells get their patterns?

The formation of shells can also create patterns. As the animal grows inside the shell, it’s home must get bigger, and so they grow their shells layer upon layer, creating ‘growth-bands’, or growth increments, within the shell. Over time, these close-to-identical bands form patterns.
Hope this helps!

Where is the painting?

Photography has changed its subject matter quite a lot over the past few years. in the 1800's, it was considered normal for families to have  post mortem photos of their loved ones, and now that would be completely unacceptable. i think that photographers have always pushed boundaries and have been eager to capture everything, it is just society that changes their boundaries.