Each NFT in this collection features a spirograph with a large number of randomly generated parameters, and is composed almost entirely of convoluted sin waves. The unique parameters for each spirograph are included in the NFT description. Because of the intentional statistical, generative behaviour, some configurations are much more rare than others. Details of the background mathematics can be found here
If you purchase an NFT from this collection for more than 0.1 ETH, I will make you a high res version of your spirograph (because you have the parameters), which can also be much longer and more evolving...
