Visual conviction
Solution 1:
seeing is believing
Idiom—used to say that when something unlikely is witnessed, the truth of its occurrence or existence can no longer be doubted
I didn't think it could happen, but seeing is believing. m-w
Proverb—You need to see something before you can accept that it really exists or occurs.
There were some people who had given up on it, but now seeing is believing.
If seeing is believing, the genuine road user today has to be content with very little space on city roads. Lexico