I enjoyed your article ‘Nature’s hidden beauty’ (September, p56) about Robert Hooke’s work, but you missed out by not mentioning an important new photographic technique that really does show the hidden beauty of nature. Electron micrographs, though minutely detailed, suffer from two failings: they cannot depict living subjects and they are invariably monochrome – except those that are artificially coloured afterwards. The technique I am referring to here is computer stacking of sequential photos. This technique can be used on living subjects (though they have to be stationary) in natural poses and shows the subject in its true colours. I would like to draw your attention to the work of John Hallmén ( johnhallmen.se). His images are both incredibly detailed and staggeringly beautiful.