Snails, synapses, subliminal imagery, Sudanese art, silliness and shifts of perspective. This week’s issue is brought to you by the letter S.

There’s lots of smiley, sunny work this week. Plus one strange set, for good measure.

There’s a lot on at the moment, but these are six shows not to miss.

New portraits, old portraits, abstracts and an arch. This week brings four different shows and locations.