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Invite your child to help you design the xylophone. Dress your child in play clothes in case the colored water spills on him or her.
Although pinging on glasses is fun, creating the xylophone is just as thrilling for small children. Make sure you explain what you are about to do so that he or she understands what you hope to achieve. Detail and list exactly what you plan to do to create the xylophone. Explain that when the glasses are filled with water at different levels, each glass will make a different sound. While most food coloring shouldn't stain, it's best not to tempt fate on your child's best clothes.