Welcome to Smartphone Picture of the Week! Each week, we select and share your best smartphone photos in an online feature ...

The self-taught artist Abraham Lincoln Walker worked in his basement on phantasmagorical paintings, discovered by the art world more than 30 years after his death.

Some of these – for example, grouping four types of fish – can be very straightforward, while others can be far more abstract. If you’ve found yourself stumped by the latter, we’ve put ...