Disassembly of 6502 code by @deater https://twitter.com/deater78/status/1368790980237791232

deatertweeter.txt

* Disassembly of @deater object tweet https://twitter.com/deater78/status/1368790980237791232
* by @65816guy / digarok/ Dagen Brock
00/00E7: 20 D8 F3      JSR F3D8         ; HGR2 -- set hi-res, page2, full graphics
00/00EA: 8A            TXA
00/00EB: 20 11 F4      JSR F411         ; HPOS2 - positions hi-res cursor without plotting
                                        ; (A) = Y-coordinate, (Y,X) = X-coordinate
00/00EE: A2 01         LDX #01
00/00F0: A0 F0         LDY #F0
00/00F2: 20 5D F6      JSR F65D         ; XDRAW - Draws a shape inverting dots (eor/xor) on screen.
                                        ; (A) = rotation, (Y,X) = address of the shape table
00/00F5: F0 F7         BEQ 00EE {-09}

From @deater:

the code loads at $E7 so that the the $20 from the JSR also acts as the SCALE size without having to load/store it

you can point the shape table anywhere in memory, I tried out a bunch of locations until I found one that looked cool, but there are probably better ones