This artistic rendering depicts electrocatalytic reactions one event at a time by measuring the burst of fluorescence (peaks) that occurs as each product molecule is reduced on a carbon nanotube (gray line).
This awesome figure is from C&E News, depicting single molecule fluorescence signals. I suppose that the “sun” in the background is the imaging laser. What are the stars, though? Dust? Well, at least they’re honest about the purity of the buffer.