Close up of the  Roots in the Sky  carbon- fibre fairing for the Presto and the two Velcro straps around the boom and front- derailleur support tube by which it is attached to the frame. . .  hard to beat in its elegance!
    Apart from above, the same company also makes (or used to make) other quality accessories for the Presto, among them a CF-cage for the idler wheel, a handlebar and a large- volume backpack attachable to the back of the seat. That's what "concept" in "concept bike" stands for. . .  that its uses have been rethought in advance.