Global view of coronal rain activity and forming prominence structures near the sunspot observed by STEREO-A/EUVI. (a1)–(a4) 171 Å and (b1)–(b4) 304 Å images are rotated counterclockwise by an angle of 70 deg, and the latter has an inverse color table. The solar disk and the FOV of these images are shown as the white circle and the rectangle, respectively. The black arrows denote two forming tower prominence structures (TPSs); the green curved arrow shows the trajectory of rain flows near the sunspot; the purple curved arrow denote the trajectory of a large-scale horizontal flow; the blue arrows mark the dip of our interest; the cyan arrows denote the feet structures of the formed quiescent prominence. It should be noted that the EUVI images were enhanced by the MGN technique (Morgan & Druckmüller 2014).