The only thing required to draw on MurAll is the PAINT token - a fixed supply ERC-20 token analogous with real-life paint; you can't take the paint off a wall and reuse it once it's on there, and similarly, any PAINT used in the drawing is burned as part of the transaction preventing it from being reused. Your contribution to MurAll will be on the blockchain in its history for as long as the blockchain lives (i.e. you will always be able to see your contribution there in the history, even if someone draws over your pixels). When you draw, you also get a MURALL Non-Fungible Token (NFT) of your contribution, a token containing your drawing, which you own and are free to do with as you please - hold, display, trade, collect, the choice is yours. There is only enough supply of PAINT to allow MurAll to be drawn over in its entirety a maximum of 21 thousand times, meaning MurAll has a finite lifespan; once the PAINT runs out you won’t be able to draw on MurAll again.