Figure 1.

A) Fabrication of shape-encoded hydrogel particles using stop-flow lithography. Shape is defined using a photomask. B) Imaging setup consisting of a 3D-printed phone stand with a built-in slide holder. C) Representative image taken of particles after reaction using the phone setup. Scale bar is 1 mm. Imaging on an orange background allows for a near-white background in the red channel (used for analysis) and near-black background in the blue channel (allowing easy identification of all particles).