Blu tack, cheap, reusable, nondestructive, and blocks light better than tape. https://en.wikipedia.org/wiki/Blu_Tack

Not saying it’s right, but only appropriate things can be advertised to children, so in the UK that’s no junk food for example - https://www.theguardian.com/politics/2026/mar/10/uk-junk-food-ad-ban-so-diluted-it-may-be-largely-ineffective-experts-say