[The] two lights...act and react like autonomous creatures. Wallace responds to changes in light intensity in its environment and brings light to the darkest corners. Having done that, it's no longer the darkest space, so he moves on, constantly bringing light where it is darkest. Meanwhile solar-powered 'Darwin' searches for sunlight during daylight hours to charge his battery, and in the evening wanders around the house seeking movement - accompanying people with his light. The interaction and emotional relationship they bring contribute to our well being. They behave like pets. They are lively lights you can play with.