Stories by Robert Ghrist

Robert Ghrist is a mathematician at the University of Pennsylvania. He works in applied algebraic topology and creates animations and visualizations of mathematics.

A rectangle is filled with lines of cubes creating paths at right angles and ladders through the space.

MathematicsApril 14, 2026

Mathematicians created an ‘impossible’ shape that shouldn’t exist

Scientists have designed a new kind of paradoxical shape

Clara Moskowitz, Robert Ghrist