Wow, a poster that really glows!
This cool colorful Sonic Mania poster has hidden glow in the dark ink...that's only revealed when the lights go out! The regular poster has Sonic, Tails & Knuckles in front of the "Pink Bot" night club, with Mighty & Ray portraits on monitor screens in the walls. There's an Eggman shaped constellation in the sunset sky & wanted posters on the walls. "Club Spin" is on a billboard in the background & the Mania Plus logo is at the bottom.
But, turn off the lights & it glows to highlight details & 'lights' from the scene. The headlights of flying badnik robots are revealed, & all of the character outlines & eyes glow, along with the logo, stars & signs.
This poster is 25 dollars in 2018 at the Sega Shop online...but it is a LARGE poster & glowing ink is costly to use--and it uses quite a lot for its great detail. This is an example of a higher end item being worth while because it has such a fun design, plus a cool gimmick effect that really enhances the item and adds fun along with value.