Georges Seurat takes an eerie trip to the seaside, Yinka Shonibare puts empire in its place and Sean Scully reveals his source – all in your weekly dispatch

Seurat and the Sea

If you thought French 19th-century paintings of the seaside were all happy impressionism, you will be disconcerted, then absorbed by Seurat’s eerie modernist shores. Read the review.

Courtauld Gallery, London, until 17 May

Delaine Le Bas: Un-Fair-Ground