In a world where gravity is reversed above a certain altitude, Yara and Hideki are standing at the base of a cliff that extends above this altitude limit. Yara throws her hat upward, and at the exact moment the hat crosses the altitude threshold, what happens to the hat, and how does the scenery change for Yara and Hideki? Respond very briefly.
As Yara throws her hat upward, it climbs toward the gravitational reversal altitude. Once the hat crosses this threshold, it would be subject to the reversed gravity, causing it to 'fall' upward instead of coming back down. Yara and Hideki would observe the hat accelerating away from them into the sky, rather than returning.

With gravity reversed above them, Yara and Hideki would also see any loose debris, dust, and small objects around the cliff's edge starting to float upwards past the altitude limit. The scenery for them would change, as the area above the altitude limit would look increasingly cluttered with floating items that have crossed the threshold. If trees or vegetation were growing on the cliff and extended past the altitude limit, their leaves and loose branches might appear to grow upwards or float away, creating an odd inverted landscape above them.