Put real spiderwebs on paper. preserve a spiderweb on paper to explore/look at. or put the black paper behind it so it can be seen in detail and then take a picture so you don't have to destroy the spider's web.
Light-Shadow tracing ~ so simple, yet so brilliant. It was this picture that inspired me to get the old light projectors from the school storage, and do a tracing activity for Groundhog Day. The kids loved the light and shadow experiment.