Awww, G-man, Finni, Gwenni and Molly are precious!!
I don't even know where I heard that term "juxtapose" because I have never taken a photography class but I think it is a photography term, LOL. My interpretation of juxtapose is basically two or more subjects, side by side, to show comparison or contrast.
IMG_0035.jpg Size or stage in life difference
IMG_0273.jpg Contrast
img_3191.jpg Comparison
It can be large vs. small, same thing different colors, it is also used to show scale, like when you see a penny or quarter next to something to show size.