A game of chain reactions, connected movements, acceleration and motion - think Rube Goldberg machine. This beautifully-designed, fast moving, wood activity set is thoroughly engaging and teaches core fundamentals of physics. An educational STEM construction toy where they learn spatial relations, cause and effect, potential energy, and momentum, all through engaging play. This little set can be combined with other action/reaction Zig & Go sets. Connect the pieces, and you can add even more to your wonderful machine! For Ages 8 and up. WARNING: CHOKING HAZARD - Small Parts. Not for children under 3yrs.