This is a box based on the volume transfer and force flow associated with
hydraulics, using syringes and tubing. The toy has plexiglass siding, and clear tubing
inside, connecting the syringes that come out of the sides of the box. The tubing
is filled with colored goo, which will engage the child's curiosity, meanwhile, he
or she is inadvertantly observing the forces of volume transfer when they push
one syringe, and the syringe on the other end of the tubing pops up !
This toy will cost approximately $25, meant for ages 3+. It is very durable, as
plexiglass is tough, and safe for nearly all ages.