From chaos to structure (IMAGE) Institute of Science and Technology Austria Caption The schematic shows that the 4-cell stage embryo gives rise to many different shapes. At the beginning of the 8-cell stage, the embryos are driven toward the most optimal packing due to simple physical laws. Credit Fabrèges & Corominas Murtra et al. / Science Usage Restrictions See Restriction of Science Magazine. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.