Interesting exhibits on various illusions and opti...

Interesting exhibits on various illusions and optical puzzles. Perhaps not the most challenging for those knowledgeable in the world of physics, but good fun nonetheless. Google recommends 2 hours but didn't take quite that long: an hour and a half + 45minutes waiting (but it is February half term and the staff were good with updates and answering questions).
Liked the regularly placed hand sanitising stations, given the high volume of young ones.