Figure 2 Photoinhibitory printing of excerpts from the first page of Ewart's paper on assimilatory inhibition on a leaf of the shade plant Cissus antarctica. A microfilm negative of the text was paper clipped to the leaf which was exposed to full sunlight for an hour. Chlorophyll fluorescence was subsequently imaged with a special video camera. Those areas of the leaf exposed to strong light under the text show severely reduced fluorescence due to photoinhibition. The latent image persists for several weeks because these shade plants repair photoinhibitory damage only slowly (Osmond et al. 1999)