The "Lilly Bell" aesthetic is defined by a commitment to a specific visual and behavioral style:
The planar elastica governing equation (ignoring shear deformation) is lilly bell kink
[ \beginaligned &\mathbfr_1(s_k) = \mathbfr_2(s_k) \quad\text(position continuity)\ &\mathbft_1(s_k) \cdot \mathbft_2(s_k) = \cos\phi \quad\text(tangent jump)\ &\mathbfn_1(s_k) \cdot \mathbfn_2(s_k) = \mu ,\mathrmsgn(\dot\phi) \quad\text(Coulomb friction) , \endaligned ] The "Lilly Bell" aesthetic is defined by a