Specific aspects of nature, such as weather and seasonal time, represent both themselves and changes in human consciousness. Symbols such as "blood" and "milk" represent specific functions of female human biology, but they also represent maturation and motherhood. The symbol of the mirror, combined with allusions to light, emphasize the idea of self-reflection and changing awareness of self-image and identity. The symbols of "twilight" and "winter" are used to emphasize middle and old age, respectively. The "sea" often symbolizes the womb, spirituality, and the dream state, but it can also represent any actual large body of water such as the Atlantic Ocean or the Caribbean Sea.