Peter Blake

Twins? There's one born every five years

Jody and Simon Blake have spent the past couple of months showing off their twins, Reuben and Floren, to friends – and delighting in the looks of bemusement that greet them. Because while Reuben went back to school yesterday, his sister, Floren, will have to wait until 2017. The children were born five years apart, but technically they are twins because they were born from the same batch of embryos.

On the menu: Vietnamese baguettes, a cutting-edge cookbook, brandy,

This week I've been eating... Vietnamese baguettes Banhi mi is one of the happier leftovers of French colonialism in South-east Asia. The weighty sandwiches combine the best of France (warm, crusty bread) with the best of Vietnam (spicy meat and lightly pickled veg), and are the stock-in-trade of Keu Deli on London's Old Street.

Camulodunum, Firstsite, Colchester

Colchester's Firstsite has a dramatic new building, a golden curving shell designed by Raphael Viñoly that hugs a garden and gently preserves an ancient Roman mosaic under a glass floor at the heart of the gallery. The Berryfield Mosaic was discovered in 1923 with a human skeleton, oyster shells and pottery, and it can be read as a kind of cornerstone for Firstsite's opening exhibition, Camulodunum (the exhibition title taken from the old name for Colchester). The tone is set by Danh Vo's huge sculpture We the People (2011), part of a larger work in which he is making a replica of each part of the Statue of Liberty in copper. Packing crates, tools and rags are strewn around a huge hand, which will never likely never find its way on to an arm.

Eyes on the Turner Prize

It is famed for its wacky works – and with one piece titled The Same Old Crap, this year's Turner Prize is no exception

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George Condo: The comedy of horror

George Condo's unsettling paintings have often led to accusations of insolence, but two new exhibitions reveal the profundity of his work