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This script displays a simplified “Mystify” screensaver known from past versions of MS Windows. It uses the kandinsky library for drawing, random library for the random corner points and the time library to pace the animation. Tested on the calculator using software version 23.2.6.

import kandinsky
from random import randint,choice
from time import sleep

def connect(x1,y1,x2,y2,co="black"):
  xspan=x2-x1;yspan=y2-y1
  steps=max(abs(xspan),abs(yspan))
  if steps==0:
    kandinsky.set_pixel(x1,y1,co)
    return
  dx=xspan/steps;dy=yspan/steps
  x=x1;y=y1
  for k in range(steps):
    kandinsky.set_pixel(int(x+.5),int(y+.5),co)
    x+=dx;y+=dy

def quadrilateral():
  x=[];y=[]
  xstep=[];ystep=[]
  for k in range(4):
    x.append(randint(0,320))
    y.append(randint(0,220))
    xstep.append(randint(1,4)*choice([-1,1]))
    ystep.append(randint(1,4)*choice([-1,1]))
  return x,y,xstep,ystep

def step(x,y,dx,dy):
  for k in range(4):
    x[k]+=dx[k];y[k]+=dy[k]
    if x[k]>=320:
      dx[k]=-dx[k]
    if x[k]<=0:
      dx[k]=-dx[k]
    if y[k]>=220:
      dy[k]=-dy[k]
    if y[k]<=0:
      dy[k]=-dy[k]
  return(x,y,dx,dy)

def drawquad(x,y,co):
  for k in range(3):
    connect(x[k],y[k],x[k+1],y[k+1],co)
  connect(x[3],y[3],x[0],y[0],co)

x,y,dx,dy=quadrilateral()
x2,y2,dx2,dy2=quadrilateral()
while True:
  #print(x,y,dx,dy)
  x,y,dx,dy=step(x,y,dx,dy)
  x2,y2,dx2,dy2=step(x2,y2,dx2,dy2)
  kandinsky.fill_rect(0,0,320,230,"black")
  drawquad(x,y,"green")
  drawquad(x2,y2,"blue")
  sleep(0.1)