This picture is an excellent visaulization on the puzzle of a single
particle's two-slit interference process:
the order of the dynamic process is:
upper-left --> upper-right --> bottom-left --> bottm right.
Note how a single particle picture is torn apart by wave inteference. BUT!
when you measure it, it should be detected as a whole particle again (all
energy of this particle is supposed to be collapsed as a capsule into the
detector -- "quantum collapse") -- that is the difference from the cl
