Incredible bottle bottom / bottle

It's a kind of wild wish for the children, with an unfortunate childhood,
from poor regions in the world to have fun with tools.But the situationcan
be improved a little and my design of the tool can make it. This kind of
mineral water bottle model can make different shapes of soil into legos
which can be transformed into the form of square, triangle and so on.
By this way, it not only makes children's dream of tools come true but
also makes the mineral water bottles utilized circularly.