How could the word "worm" be a metaphor for science? Because worms are always exploring, moving about in the soil, they are living things and they also have feelings (according to Darwin- http://charles-darwin.classic-literature.co.uk/formation-of-vegetable-mould/)
What's the difference between words and pictures? Pictures can create many opportunities for using words, but words are limited. I liked drawing my idea of science and what I think my students think of science. I associate Chemistry experiments as a visual image of science in general terms. I think the students in urban settings may visualize science as what's in the sky, in water, and walks on land.