In 1961 Eugene Wigner wrote a paper, titled Remarks on the mind–body question, suggesting that a conscious observer played a fundamental role in quantum mechanics,[1][14]:93 a part of the Von Neumann–Wigner interpretation. While his paper would serve as inspiration for later mystical works by others,[13] Wigner's ideas were primarily philosophical and are not considered "in the same ballpark" as the mysticism that would follow.[15]