The number 108 - I have always seen this number as mysterious. I often feel "lost" in this number and will change hotel rooms if 108 is allocated to me. Maybe it is because of the divine proportion of this number... scary but true.

The squares - I always think of the red square floating into the black square when looking at this images. Yet, you have the exact chance of winning on red than on black. So, what will it be black or red?