what's this?
a screw
what's this?
a cello
what's this?
scientist
what's this?
conductor
what's this?
orchestra
what's this?
astronaut
what's this?
a ramp
what's this?
an axe
what's this?
a seesaw
what's this?
a lightbulb
what's this?
a doorknob
what's this?
a slide
what's this?
panpipes
what's this?
a flute
what's this?
a lever
what's this?
a violin