space/flying and inaccessability

My collection, so far, is made up of things created from this conscious criteria: things which relate instruct in a primary function, or are related to causing something to do what it is made to do, with the object itself missing. Ok, that's not very clear. But the things I intuitively picked were these: a lego assembly instruction manual (missing legos), a comprehensive list of keyboard shortcuts (missing game, computer, keyboard, and joystick), a 10x finder scope (missing telescope), a model rocket electronic launch controller and wires (missing rocket and launch pad), a book called "Tell me about Sun, stars, and planets." (Missing, obviously....). Finally, i also had a little brass device called a lyre, which clips onto a saxophone and holds up a miniaturized flip book of sheet music for marching band (saxophone, music, and flip book not included).
Intuitively, I found, I had (with the exception of the lyre) chosen objects related either to space, or flying. (The keyboard shortcuts were for "Jane's Combat Simulations USAF")

So clearly, the main theme is air and space, and I should probably replace the lyre with something closer to this. Because this topic is so highly valued in American culture I think I will probably try displaying my collection in some kind of museum style case, although on the other side I could try disrupting the convention- but if I took this approach, I would need to plan carefully so it appears intentional, not just sloppy or haphazard.