Exploratorium has a gallery of try-it-yourself perception experiments. There’s plenty of great material here, not least because of the the slightly bizarre photos of people with distracting 80s haircuts.
There are quick projects on everything from proprioception to taste, and you can tell which are the good ones because they list ‘adult help’ as one of the materials.
Think of it as the Mind Hacks that time forgot.
Link to groovy gallery of Exploratorium perception ‘snacks’.