I love this illustration from Swedish artist Mattias Adolfsson, drawn on two pages of a Moleskine notebook. The incredibly dense scene (only a small fraction of it seen above) captures the perceived complexity of an airplane cockpit in the eyes of a child. You can zoom into the details of the 36 megapixel scan of the image here. Adolfsson also drew a view of the imaginary plane's exterior, as well as a similar second cockpit scene for a commission. The rest of his work is just wonderful stuff.
(h/t FastCoDesign)