  Two-dimensional pin array tactile displays enable access to tactile graphics
that are important for the education of students with visual impairments. Due
to their prohibitive cost, limited access, and limited research within HCI, the
rules to design graphical primitives on these low-resolution tactile displays
are unclear. In this paper, eight tactile readers with visual impairments
qualitatively evaluate the implementation of Pixel Art to create tactile
graphical primitives on a pin array display. Every pin of the pin array is
assumed to be a pixel on a pixel grid. Our findings suggest that Pixel Art
tactile graphics on a pin array are clear and comprehensible to tactile
readers, positively confirming its use to design basic tactile shapes and line
segments. The guidelines provide a framework to create tactile media which
implies that the guidelines can be used to downsize basic shapes for
refreshable pin-array displays.
