The individual colleges of the University of Cambridge can call, when needed, on an astonishing international network of alumni for expert advice, consultation and financial support. Such is the backing for an exquisite new public gallery on the site of Edwardian stables in the grounds of Downing College there.

Now that Renaissance altarpieces live for the most part in museums and not churches, our experience of them is, quite literally, flat. Once, the winged altarpieces so popular in northern Europe, comprising a central panel flanked by two moveable “doors”, would have changed appearance according to the Church calendar, the wings left closed during Lent to be opened again at Easter when the glorious colours of its central image would once again be revealed.

Painting the Modern Garden explores the interstices between nature and ourselves as revealed in the cultivation of gardens, that most delightful and frustrating of occupations, and an almost obsessive subject for many artists. About 150 paintings from the 1860s to the 1920s, gathered together from private and public collections in North America and Europe are on view, amplified by letters, plans, documents, photographs and illustrated books on horticulture.

One of the great joys of being a critic is discovering someone remarkable you’ve never heard of before. By the time he died in 2013 aged 90, the American photographer Saul Leiter had gained a degree of recognition, but it had been slow in coming and only now is his work gaining an international reputation. 

Artist and filmmaker John Akomfrah’s multi-screen film installation Vertigo Sea is an epic meditation on mankind’s relationship with the watery world. Exploring themes of migration, environmental destruction and slavery, it was one of the most talked about works at last year’s Venice Biennale. Now at Bristol’s Arnolfini, the location couldn’t be more fitting. Housed in an old warehouse, the gallery is just a stone’s throw from the city’s floating harbour, near where, three centuries ago, ships arrived laden with human cargo.

“Finding the Light”, the second episode of this four-part series, took us to the period when Scottish intellectuals led the world in innovative and revolutionary thinking, Edinburgh’s neo-classical architecture in the leafy streets of the New Town made for new standards of civic architecture, and Scottish education could be of the highest quality.

For his latest journey Michael Palin, actor, writer, novelist, comedian, Python, traveller, has gone beyond geography in search of the visual arts with his characteristic enthusiasm, eclectic curiosity, and sense of discovery.

Minimalist sculpture has, for decades, been making gallery visitors self-conscious. How should you react to a metallic piece by Donald Judd which has evidently been machined rather than modelled? Can you really walk all over an arrangement of lead floor tiles by Carl Andre? And how do you look at a Robert Morris mirrored cube without seeing yourself gazing back?

I think of Rose English as the performer who made Miranda Hart’s success possible. I remember seeing her back in the 1980s, improvising solo at a theatre in Chenies Street. She had the audience curling up with embarassed laughter as she took off her heavy boots, stuffed her large feet into dainty ballet pumps and slipped a delicate tutu over her too, too solid frame. While gallumphing around the stage trying to look as elegant and etherial as an anorexic ballet dancer, she addressed various topics such as ambition, longing, appearance, desire, gender and so on.

Following his inclusion in this year’s Venice and Istanbul biennials, Italian artist Fabio Mauri has leapt into the limelight. He is from the same generation as Mario Merz; but whereas Merz and his Arte Povera colleagues have long since enjoyed an international reputation for work which features non-art materials in a raw state (hence the name "Poor Art"), Mauri has languished in relative obscurity – until now, that is.