Paper Plane Through the City’s Four Seasons

Create a realistic, cinematic fantasy short film, 15 seconds long, in 16:9, 720p. The same ivory hand-folded paper plane is the sole protagonist throughout; its paper texture, creases, size, and flight direction remain consistent. Use a single, continuous low-altitude tracking shot, with the camera about half a meter behind the plane, moving smoothly forward. No sudden cuts or clipping through objects.

From 0 to 3.5 seconds: a spring morning street in the old town. Cherry blossom petals drift past in the breeze as the paper plane flies out through an open classroom window and the camera immediately follows. Soft morning light, clear air; the only sounds are wind, distant birdsong, and a very light piano intro.

From 3.5 to 7 seconds: the paper plane sweeps behind a nearby tree canopy, using the occlusion for a natural transition. The street shifts to a midsummer afternoon, with dense green shade and a brief shower. A few raindrops cling to the paper, but it does not tear or deform. The camera maintains the same distance and direction of movement; rain and piano grow slightly louder.

From 7 to 10.5 seconds: the paper plane skims close to a passing old bus, using its body to occlude the view and transition to late autumn dusk. Golden leaves swirl in the same wind direction, and the setting sun from the right side of the frame illuminates the plane’s creases. It dips briefly, then is lifted again by the air current, moving in a way that obeys air resistance, never teleporting.

From 10.5 to 15 seconds: the paper plane flies through a nearby bank of white mist, and the street becomes a quiet winter night, with a light covering of snow on the eaves and road. The camera gradually swings around to the side-front of the plane, revealing a boy of about eight in a dark blue padded coat at the mouth of an alley. He raises his hand and catches the paper plane, then looks down and sees a line of childish pencil writing inside the wing: 「给长大后的我」. The boy pauses for one second, then looks up in the direction the plane came from. The piano leaves only one trailing note, and the image comes to a natural stop.

All four seasons must take place on the same street and along the same flight path, with continuous building layout, screen direction, and camera axis. There is only one paper plane throughout; its color, material, folds, and size do not change. Seasonal changes happen only through occlusion transitions, lighting, vegetation, weather, and ambient sound. No extra paper planes, people suddenly appearing or disappearing, garbled text, melting paper, jump cuts, flickering frames, platform watermarks, subtitles, narration, or extra dialogue.

生成一支15秒、16:9、720p的写实电影质感奇幻短片。全片以同一架米白色手折纸飞机为唯一主角，纸张纹理、折痕、尺寸和飞行方向始终一致。采用一镜到底的低空跟随镜头，镜头位于纸飞机后侧约半米，平稳向前移动，不突然切镜，不穿模。

0至3.5秒，清晨的老城区春日街道，樱花花瓣随微风掠过，纸飞机从一扇打开的教室窗户飞出，镜头立即跟上。柔和晨光，空气清透，只听见风声、远处鸟鸣和很轻的钢琴前奏。

3.5至7秒，纸飞机从一棵近景树冠后掠过，遮挡完成自然转场。街道进入盛夏午后，绿荫浓密，短暂阵雨落下，纸面沾上少量水珠但不破损、不变形。镜头保持相同距离和运动方向，雨声与钢琴节奏略微增强。

7至10.5秒，纸飞机贴近一辆驶过的旧公交车，利用车身遮挡转入深秋黄昏。金黄色落叶沿同一风向卷起，夕阳从画面右侧照亮纸飞机折痕。它短暂下坠后重新被气流托起，动作符合空气阻力，不瞬移。

10.5至15秒，纸飞机穿过一团近景白雾，街道进入安静冬夜，屋檐和路面覆有薄雪。镜头逐渐绕到纸飞机侧前方，露出巷口一名约八岁、穿深蓝棉衣的男孩。他抬手接住纸飞机，低头看见机翼内侧有一行稚嫩铅笔字「给长大后的我」。男孩停顿一秒，抬头望向纸飞机飞来的方向，钢琴只留下一个尾音，画面自然停住。

四季必须发生在同一条街道和同一飞行路径上，建筑空间、屏幕方向和镜头轴线连续。纸飞机全程只有一架，不改变颜色、材质、折法和大小。季节变化只通过遮挡转场、光线、植被、天气与环境声完成。禁止额外纸飞机、人物突然出现或消失、文字乱码、纸张融化、镜头跳切、画面闪烁、平台水印、字幕、旁白和多余对白。