In the past few months, we have covered plenty of trippy blacklight reactive toys here. The Motorized Hoberman Mini Sphere Orbiter is also worth a look. It is an expanding toy that reacts to UV blacklight as it expands and contracts on its base. The below video shows the Hoberman Mini Sphere Orbiter in action:
This cool toy is pretty rare as it was made in the 2000s but you can find it on sites like eBay.