# MiniMax H3 connected-vessel prompt: open the visible path before levels change

Make two level changes belong to one visible connection. The shot should explain why liquid can transfer between fixed containers, including the initial closed valve rather than starting with unexplained equalization.

Original synthetic practice still, not a generated result. No model run has been performed.

Files: first-frame.png (1024×1024 actual first-frame input), first-frame.svg (editable geometric design source; do not upload as if it were PNG), prompt.en.txt / prompt.zh.txt, acceptance.blank.csv (all observations empty), task-definition.json and RIGHTS-REVIEW.txt.

## Generator

Use MiniMax H3 base image-to-video. Turn on Add end frame to expose First Frame, upload first-frame.png only, and leave Last Frame empty. Fast requires a pair and is not covered. Choose only options offered by the current interface; opening it does not submit.

## Starting state

The original diagram shows two open rectangular reservoirs with a low tube between them. The left liquid level begins higher than the right, but a clearly visible vertical valve handle blocks the horizontal connection. Both levels are static in the supplied still.

Keep both reservoir walls and the connecting tube fixed. Identify the valve handle, each liquid surface and the enclosed tube path. Unequal initial levels are not an instruction to begin flow while the visible valve is still closed.

## Steps

1. Inspect the initial two levels and closed valve in the PNG. A replacement input must make the actual connection readable; adjacent unconnected tanks do not define this task.
2. Keep the visible unlock/open event before the paired level change. Ask for only partial convergence so walls, valve and both surfaces stay available for comparison.
3. When a later output exists, record the opening frame, the first visible paired change and the ending. Check the route before interpreting two moving blue boundaries as one transfer.

## Acceptance

- Both reservoir outlines and the low tube stay fixed and continuously connected.
- The visible valve opens before either level begins the requested equalization.
- The higher left level falls while the lower right level rises over the same interval, without liquid crossing the exterior gap.
- The ending levels are closer, with the valve open; no calibrated equality or volume result is prefilled.

## Limits

This untested visual method does not certify hydrostatics, calibrated volume, valve behavior, exact flow speed or model compliance. No generated result is included.

Read prompt.en.txt before submitting. No pass results or output video are included.