A pose is a process, not a shape
A photograph of a pose is the one part of it that was never the point.
Describe a pose as a path from a starting position rather than as a finished position.
Every pose begins somewhere: standing, sitting, kneeling, lying face up, lying face down, or on the arms. Getting there is most of the information.
What has to move, in what order, and what runs out first are all things the finished shape hides. This is why the variations here are better read as points along a path than as easier and harder versions.
The variation with a block under the hand is not a lesser Triangle. It is a different place along the same process, with a different base and sometimes a different spine.
Triangle Pose begins before its final shape
Starting position, widening the base, and tipping the torso form one process.
This is a simplified learning diagram. It is not a reviewed anatomical illustration.
Triangle Pose
Open Triangle Pose and step through all three variations in order, reading the base of support each time. Notice that the pose name never changed and almost everything else did.
Stand up from your chair slowly enough that you can feel every part of it.
Notice: The standing was never the pose. The whole thing was.
This is noticing, not instruction. Move as little as you like, stop at any point, and watching instead of moving is a complete way to take part.
Can you describe one pose as a sequence rather than as a position?
Pause before opening Practice. Say the distinction in your own words.
What had to happen before this shape could exist?
Breath and movement material here is study language, not instruction or therapy. Every invitation is optional: move as little as you like, stop at any point, and watching instead of moving is a complete way to take part. Do not prescribe breath holds, retention or bandha practice.