Plot twist, it was the only ball sowjets have - that’s why sowjets were so good at hockey.
It’s from the same research programme that developed Rover, the spherical hunter-killer sentry used to guard secret facilities in the 1960s.
They used so much knockout gas back then.
Spoiler: It’s a weather balloon. They made it pink because it was breast cancer awareness month (I don’t fucking know, visibility I guess)
The Golden Gate Bridge is bright red-orange because that’s the most visible color against the blue sea. I’d assume similar colors are used to contrast against the sky. Much like that (creepy by association) teal that’s used for medical accessories, which contrasts with blood.
I can’t say that’s going on with this bouncy ball, but painting things a bright color that contrasts with nature is a thing we do.
He bounced three meters in the air, then he bounced 1.8 meters in the air, then he bounced four meters in the air.