the effects of beauty

There are so many questions... and the answers come through deductive reasoning... because really... who is to say? It is so subjective. But when I wander through the Metropolitan Museum, or turn to watch a beautiful girl,stop and enjoy the arch of a doorway or stop to enjoy the magical change from day to evening, the composition of a rosebud ina small vase... I sometimes wonder.. why is it that human beings are hardwired to respond to anything that is beautiful?