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We study the formation and evolution of localized geometrical defects in anindented cylindrical elastic shell using a combination of experiment andnumerical simulation. We find that as a symmetric localized indentation on asemi-cylindrical shell increases, there is a transition from a global mode ofdeformation to a localized one which leads to the condensation of curvaturealong a symmetric parabolic crease. This process introduces a soft mode in thesystem, converting a load-bearing structure into a hinged, kinematic mechanism.Further indentation leads to twinning wherein the parabolic crease bifurcatesinto two creases that move apart on either side of the line of symmetry. Aqualitative theory captures the main features of the phenomena and leads tosharper questions about the nucleation of these defects.Comment: 4 pages, 5 figures, submitted to Physical Review Letter

Curvature Condensation and Bifurcation in an Elastic Shell