During development, tissues are pushed, pulled, and folded into complex shapes. The brain begins as a flat sheet of cells, called the neural plate, that folds and zips up into a neural tube. The neural plate has a network of force producing filaments on its surface that helps fold it into the neural tube. To understand how the network promotes neural tube folding, we created the first high-resolution map of the filaments across the entire folding neural tube. We are now using the pattern of filaments from this map to build a theory describing how the neural tube folds.