is glass hard to make ? we need loads more windows !
more lights too..... handy to hang a block down from the roof and stick a torch on each corner of it for the places the ones around the walls dont reach :-)
Glass is easy, just stick some sand and something which burns in a furnace and wander off and make a cuppa. Coal is the best fuel but anything wooden will also work, off the top of my head the efficiency goes something like
buckets of lava>coal>planks>logs>sticks
apparently buckets of lava burn for ages, but you lose the bucket.