These are a pair of homemade air canons. They are made from a mixture of wood, guttering, duct tape and an envelope. Its taken my Dad and I 2 and a half days to make and paint them but now thy look rather spiffy.
You place playpen balls down the barrel using one of the poles seen between the canons. This inflates the bag at the bottom allowing you to jump on it and shoot them out.
The design was developed by someone else - we simply created a copy (with permission) from a few photos of them in action. They work pretty well, firing the balls up to 20-ish metres xD
Next time they have playpen balls in the charity shop I am soooo buying them...
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