We have built over 100 different science museum exhibits, mostly for the Cambridge Science Centre. These have included electrical generators, ball runs, stick insect cages, logic blocks and dissected household items.

We think that 95% of the time a small exhibit can teach and fascinate your visitors just as much as a large exhibit. Plus they have the advantage of being much cheaper, and you can get 2-3 times as many in the same space, allowing your visitors to explore more science, and making it more likely they will find something that inspires them.

Build a paper flying machine and then launch it using a tall tube. Experiment with different shapes and see how they behave.
A version of our gear wall exhibit that works as a tabletop exhibit so it can fit in different places.
Build your own machine with gears, pulleys, cams, and other mechanical devices.
A monitor which appears to be broken, it just shows a white screen whatever is plugged into it. However it you put a piece of polariser up to it and a picture suddenly appears.
Ball or marble runs are fun, but when you can reposition all the parts, and the balls are blown up to the top again, they are brilliant!
A ball run is a good exhibit, but if you add a way of lifting the balls back up to the top again you get something great.