(1)艾萨克·牛顿1672年提交给英国皇家学会的信件:"Comparing the length of this coloured Spectrum with its breadth, I found it about five times greater; a disproportion so extravagant, that it excited me to a more then ordinary curiosity of examining, from whence it might proceed." (译文:将这彩色的像(光谱)的长度与它的宽度进行比较,我发现长度大约是宽度的五倍;这样离谱的不成比例,激发了我超越寻常的好奇心去研究它究竟从何而来。)