The background image shows individual traces of fluorescently labelled telomeres, the end parts of chromosomes, in the nucleus of a living mammalian cell. The blue cloud is an artistic rendering of the volume occupied by the nucleus of the cell. For more details see the paper by Bronstein et al., Phys. Rev. Lett. 103, 018102 (2009). Figure courtesy Yuval Garini, Bar-Ilan University.