We describe a minimal realization of reversibly programmable
matter in the form of a featureless smooth elastic plate that
has the capacity to store information in a Braille-like format as
a sequence of stable discrete dimples. Simple experiments with
cylindrical and spherical shells show that we can control the number, location, and the temporal order of these dimples, which can
be written and erased at will. Theoretical analysis of the governing equations in a specialized setting and numerical simulations
of the complete equations allow us to characterize the phase diagram for the formation of these localized elastic states, elastic bits
(e-bits), consistent with our observations. Given that the inherent
bistability and hysteresis in these low-dimensional systems arise
exclusively due to the geometrical-scale separation, independent
of material properties or absolute scale, our results might serve as
alternate approaches to small-scale mechanical memories.