絹谷幸二天空美術館
A small 27th-floor exhibition in the Umeda Sky Building's opposing tower, showing Koji Kinutani's work — bright-colored 3D paintings that pull Japanese mythology into a contemporary visual language. Entry around 1,300 yen and covered by the Osaka e-pass, which makes pairing with the observation deck a no-brainer.
Do this right after the Umeda Sky Building observation deck — same building.