https://bsky.app/profile/nst021.bsky.social/post/3lbamicbkes23 -> 440 bytes

lines_mini.py

import pygame as p
import random as m
R=range
r=m.randrange
S=(480,320)
def n(l,v):
	for i in R(4):
		v[i]*=-1+2*(l[i]+v[i]in R(S[i%2]))
	return[l[i]+v[i]for i in R(4)]
V=[[r(-9,9,2)]*4for _ in R(5)]
L=[[r(x)for x in S+S]for _ in R(5)]
p.init()
s=p.display.set_mode(S)
while 1:        
	L=[n(L[g],V[g])for g in R(5)]+L[:8*5]
	s.fill([0]*3);[p.draw.line(s,[255]*3,l[0:2],l[2:4])for l in L]
	p.display.update();p.event.get();p.time.delay(100)