1). Sthanaka the standing pose
2). Asana the sitting pose, and
3). Sayana the reclining pose.
Here he is obviously represented in the first form, which symbolizes that Vishnu is the cosmic axis or tree of life, standing straight as a post, connecting the earth to the heavens above. To his devotees, this formal, hieratic representation of Vishnu - their refuge and protector - standing like a mighty pillar, is a deeply comforting sight.