Improved Windows
Right now, the vanilla windows are quite limited. The 2X1 sloped glass, for example, is very difficult to use because sometimes it's impossible to fill a gap. If vanilla windows were overhauled to be like the sloped armor blocks, it would allow players to create a wider variety of glass shapes. 2X2X1 triangles and inverse triangles would be very helpful in filling in gaps in windows built with the 2X1 slopes, just like Sloped Corner, Sloped Corner Base, and Sloped Corner Tip blocks were for armor blocks.
The Bay Windows are very nice, but if diagonal bay windows were added, it would allow players to build at 45 degree angles. The Bay Window corner block is already in the game, so all that needs to be added is an inverse corner equivalent. It would look like the reverse of the diagonal recessed wall, if that makes sense.
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