When he was Two, younger and more flexible than One, he decided he needed a tool. It was small and shabby like himself, and it wore out, but not before he was Three.

When he was Three, he made it a little more sonic, a little more flashy, to reflect himself. That one broke, and then he was Four, and he added a bobbly bit, because everyone knows that bobbly bits improve things, or at least that's what he thought when he was Four. But that one was destroyed, and then he had none.

When he was Seven, he discovered that he missed the tool. He'd fancied himself rather dapper as Seven, and so he made it sleek and simple, with a focusing ring on the top that was rather out-of-date, but the more lovely for being so.

And then he used it to destroy his home, and he destroyed it too, because he was Nine, and Nine did not appreciate reminders. It had proven itself too useful, though, so he made another, with a flashy blue light to remind him of his Tardis.

As Ten, he taps it against his lips, and wonders how the next one should look.