arches - OBBL Architecture Blocks

Floating Arches and Balls

Hints and Ideas:
* Yellow arch pieces have "glue." They can stick together in certain ways.
* You can build layers of arches (or half-arches) on top of other layers.
* You can make "floating" balls using half-balls. But each block needs to be supported. You might need to use thumbtacks to hold the blue half-ball blocks in place at first. Then you might be able to replace them with bubbles. (If the bubbles are trapped by other blocks above them, they cannot float up. But they will try to find an escape route!)
* Use thumbtacks only as a last resort, if there is no other way to support the blocks.
* Just for fun... what happens if you remove the bottom thumbtack from the second set of arches and balls?