3I/ATLAS was discovered on July 1, 2025. It was following a highly improbable trajectory that made a relatively close approach to Mars, Venus, and now Jupiter. I became fascinated by 3I/ATLAS immediately. In late August I was pointed to the MEDIUM.COM website. There I began publishing articles, mostly about 3I/ATLAS. These articles trace my growing conviction that 3I/ATLAS is an artificial construct, some sort of spacecraft. As it seems likely that 3I/ATLAS will continue on past Jupiter and leave the inner solar system, I choose to publish this now, before 3I/ATLAS fades from peoples' awareness.