A two-day exhibition that started Friday at Tokyo's Science Museum provides a glimpse at efforts being made at prisons nationwide to help inmates return to society through handicraft skills.

The 57th annual free event, which showcases works made by inmates at prisons and correctional centers for young offenders, started with a ribbon-cutting ceremony attended by celebrities including singer Atsushi from the R&B group Exile, appearing in a prison guard uniform.

Among the more than 50,000 items on display and sale at the Chiyoda Ward museum are those that prominently feature an encircled kanji logo reading goku ("prison") , which are becoming popular, according to the ministry.