Next step is photovoltaic, sentient Paint you can apply anywhere as per the amazing Stephen Baxter: https://books.google.co.uk/books?id=q1FyDAAAQBAJ&pg=PT1613&

Next step is photovoltaic, sentient Paint you can apply anywhere as per the amazing Stephen Baxter: https://books.google.co.uk/books?id=q1FyDAAAQBAJ&pg=PT1613&lpg=PT1613&dq=baxter+sentient+paint&source=bl&ots=TU9vBZ7XgG&sig=Ljy5aypfE561m6ZHhaYq_ON-y4c&hl=en&sa=X&ved=0ahUKEwj728qZzb7QAhVsLsAKHQR_A_QQ6AEIPTAF#v=onepage&q=baxter%20sentient%20paint&f=false https://books.google.co.uk/books?id=q1FyDAAAQBAJ&pg=PT1613&l...