Haven't we all played with science kits?
I made this for a grandson who is scientific minded. I managed dots, stripes and checks. The front of the card swings aside to reveal the hidden message underneath. I mounted the panel on a side opening black base card. It's from a tutorial by Jennifer McGuire called "Simple Swing Reveal Card" on youtube. https://youtu.be/jkLV4F8Rolocolouroflove/zaner-the-mad-scientist
Rectangle die on panel: Nellie SNellen
Rectangle die (on reveal): Dienamics
Sentiment stamp (reveal):
Also various papers, Copics, WoS, Kindyglitz, white pen
Shared on challenges:polkadoodle-36-anything-goes