Darwin and 4 year old twins

I have been watching a 1978 mini-series called "The Voyage of Charles Darwin" which has been really interesting. I have always been interested in biographies, but this is especially interesting because it goes through the process of making a scientific discovery. It relates directly to my studies and guiding students through the questioning and enquiry stages that lead to scientific understanding. It is interesting that Darwin was supposed to enter the clergy after his voyage on the Beagle. It is also interesting that he should have made observations regarding the formation of mountains, as my understanding is that continental drift theory was established in the 60's. It reminded me about the context of his discovery and the state of science in the mid 1800's. If science can progress that far from then till now, there must be still so much we do not know. It makes me what to be a scientist.

Another thing I have found interesting is my work with a set of four-year-old twins, a boy and a girl. They both like to draw, so I have incorporated drawing into our lessons. I do not dictate the subject of their drawings, and they always seem to draw similar things. The boy likes to draw houses and airplanes and rockets. The girl draws suns, many of them, although she is sometimes influenced by her brother and will draw something concrete, along the lines of whatever he is drawing. The thing that strikes me most is that she always draws her suns with many colors. I know that the light of the sun is made of many colors, but I cannot see that. How does she know? Maybe she doesn't "know", but it is strange.