In December ... using his father's old computers, Mutanga
recreated the trailer for "Spider-Man: Across the Spider-Verse" shot for shot to look as if it belonged in a Lego world.
He shared his version of the trailer online. The quality of his self-taught craftsmanship quickly gained attention and reached Phil Lord and Christopher Miller, the directors of "The Lego Movie" and two of the writer-producers of "Spider-Verse."
After deciding to include a segment in a Lego universe, Christina Steinberg, another of the film's producers, contacted Mutanga to ask him if he wanted to animate it.
...
Over several weeks, first during spring break and then after finishing his homework on school nights, Mutanga worked on the Lego sequence. Every other week, he would meet via video with Miller, who would check on his progress and provide detailed input.