In May, 2013, Weinstein delivered a lecture, Geometric Unity. It was promoted by Marcus du Sautoy as being a possible answer to some of the problems in modern physics. Few physicists attended the original lecture, and no paper or preprint was published. The claims were met with skepticism by several commentators. A repeat lecture was organised the following week with more physicists in attendance. His theory includes an "observerse," a 14-dimensional space, and predictions for undiscovered particles which could account for dark matter. Joseph Conlon of the University of Oxford pointed out that some of these particles should already have been seen.