To tile around curves you can use a technique called Keystoning. This allows the tiles to sit next to each other without any gaps between them. When executed well your grout lines will run parallel and you won’t have a triangular space between the tiles.
Mosaic Mirror: Mirrors make rooms seem larger and livelier - let this project help you achieve that! Using colored glass mirror tiles, you'll make an inspiring creation that will reflect like a disco ball and cascade light into your room.