I've had the best results with a digital camera, which has allowed me a variety of ways to print out images. One powerful way of sharing is to print out the children's work on overhead transparencies. In this mode, the entire class can share investigations together. Seeing pictures of themselves is highly motivating and helps the children stay focused as they describe what they did or what will happen next. It's also easy to write and rewrite statements right on the transparency, thus modeling the writing process.
Children can even have their own copies on paper.
As a teacher I have learned much from my interaction with the Institute for Inquiry Learning Group and from my own four-year exploration into children's inquiry learning. The different phenomena of light and color are fundamentally interesting and connect children to the real world using sophisticated tools, language, and ideas. I have seen how language develops during the inquiry process. As children share what they see, they find words to express and refine their thinking. As my students have taught me over and over again, kindergartners can indeed do inquiry.