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0,1,0 for a circle. 6, 66, 666, 66, 6 is quite nice quite quickly. 60, 66, 60 is quite hypnotising to watch though not too long. 6, 3, 6.2, 3, 6 looks pretty cool.
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I looked at the updates section saying in 2010 Geosketch 3 would be release in April, but then I realised... April 1st... will we ever get Geosketch 3?
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Be forewarn that previous modifications affect future paintings if you don't press space after setting your numbers. 80,80,1,1 got me 3 - 4 different things based on how the lines were rotated previously
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[3.1] [18] [3.1] with the mode being "x2", this will create an eye form complete with iris and shadows, everything you would want!
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How to draw a buzzsaw: Set the drawing thing to mode 2. Then make sure you have three lines and write 62 0 62 as the values of the lines. Then hold your left-mouse button for a moment and you should have a buzzsaw.
How to draw a wheel: Do the buzzsaw stuff, but hold your mouse way longer.