GT Haptik is a monolinear grotesk typeface. It is the result of research undertaken by Reto Moser and Tobias Rechsteiner from 2009 to 2014. The research was concerned with the possibility of reading a Latin typeface by touching it blindfolded. Its uppercase letters function both tactile and visually.
Those specific circumstances lead to the visually unique features of GT Haptik. Optical corrections like the balancing of horizontal and vertical stroke width appearance or the lowering of middle bar in the E are not existing the capital letters and numbers. Additionally, certain letters like the R, C, and G contain specific design elements to help the fingers to follow along.
Lowercase letters were added later, to complement the typeface for text usage. Their design is focused on achieving an optically balanced texture. Lowercase letters would often be too complex to be read by touching, so no considerations in that direction were made in its design.