O-Mat is an interactive play mattress designed for children. It features a stuffed animal puzzle in the inner circle and a background setting on the outer part. This activity mat offers multiple ways to engage a child's imagination: it can be used for puzzle play, storytelling, and stimulating curiosity. Children can use the light pen to draw and discover invisible images hidden under leaves, rocks, and clouds. O-Mat is a collaborative project by Nesia Anindita and Pornpavee Ditcomeroeng.