WE are, surely, living in the optimum moment for outdoor visual arts. That is particularly true of artworks that address themselves to the pandemic. Praise is due to Edinburgh Science Festival, therefore, for programming artist Luke Jerram’s new piece In Memoriam as part of its extensive al fresco art offering. This touring installation work is both a memorial to those whose lives have been taken by Covid-19 and a tribute to health workers. Consisting of a series of blue and white NHS bed sheets which flutter like flags from tall metal poles, it is currently located in Edinburgh’s beautiful Royal Botanic Garden (free ticketed entry must be booked through the Garden’s website). If one could get a bird’s eye view of the piece, one would see that it is arranged in the shape of a medical symbol (a blue cross in a white circle).