Hi Charles,
looks like an Easter egg!
this is more tricky.
indexbase 0
include "window.h"
SetWindow "Sinus",800,600,w_1
SetFont 12,32,0,""
SetColorKey 128,255,128
sys cb, gr, xa=250, ya=150, za, float r
cb= LoadBmp "cball/cball32.bmp",256,256
gr= LoadBmp "cball/ground_1c.bmp",800,600
While WinExit=0
SetBmp gr,0,0,800,600,0
SetBmp cb,cos(r*pi/180)*120+xa,sin(r*pi/180)*80+ya,256,256,za
SetBmp cb,-sin(r*pi/180)*120+xa+100,cos(r*pi/180)*80+ya+50,128,128,za
SetBmp cb,sin(r*pi/180)*120+xa+50,-cos(r*pi/180)*80+ya,96,96,za
SetBmp cb,-sin(r*pi/180)*120+xa+50,-cos(r*pi/180)*80+ya,64,64,za
za +=1: iF za=32 Then za=0
r +=1: iF r>=360 Then r=0
DoEvents
SwapBuffers
WaitFrames 60
Wend
WinEnd
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