looking through an object
at the edge of
balance
clean
continuity
copy space
cube
double refraction
exploration
geometric
glass
glass brick
mirror
neat
no one
nobody
optical instrument
physics
prism
reflectance
reflection
refraction
research
scholarship
science
see through
sides
simple
single object
solid
sparse
square
square shape
stability
symmetry
threedimensional shape
translucent
transparent
volume