Swimming cells typically move along a helical path or undergo longitudinal rotation as they swim. arising from chiral asymmetry in hydrodynamic drag or propulsion bending the swimming path into a helix. Helical paths are beneficial for some forms of chemotaxis. but why asymmetric shape is so prevalent when a symmetric shape would also allow highly directional swimming is unclear. https://jalyttlers.shop/product-category/rattle-blanket/