The upper interior surface of a room is called the ceiling. The upper exterior surface of a building is called the roof.
A tall apartment building has many ceilings inside it, because each level has its own ceiling - but it only has one roof, at the very top.
KNEX 52 Model Building Set
Build one KNEX model every week for an entire YEAR.
52 models, thats a lot of building fun.
Children open the lid and dump out 618 KNEX building pieces logic and excitement build together.
Construct a camel, butterfly, praying mantis, golf cart, sailboat, dinosaur, hummingbird, centipede, lizard, pickup truck, skyscraper, windmill, train engine and thats just the first 13.
Build one model a week and this tub lasts a whole year, or build all 52 models in one week kids are energized with creativity.
Follow the instructions or your imagination. Build and rebuild all day long. With the KNEX 52 Model Building Set, how you build and play is entirely up to you.