Scientists from the University of Granada (UGR) have discovered that oysters are capable of producing three-dimensional structures organized by physical (colloidal) processes—the result of which resembles a solid foam—by using a unique technique, similar to that of a 3-D printer. This technique enables them to develop their shell structures sheet-by-sheet, which resolves the problem of limited extrapallial space (the small space that separates the mollusc from its shell). The findings of this study have been published in the prestigious Journal of the Royal Society Interface.