Adwartise, a canvas where ads can be overwritten

Field notes

The site divides a 25×25 grid into 625 coordinate-labelled advertising cells, with prices exposed directly on the page. Most visible cells remain at $1, while a central run from roughly I11 through R12 is marked at $11, suggesting that individual placements can be repriced rather than sold once. The homepage states that images, videos, and GIFs can occupy cells and that prior purchases remain in a public history.