These are magically beautiful! There is soo much glassware available and the market for depressionware glass has slumped. A beautify way to preserve or collect glass. Found though ReFab Diaries: Repurpose: Scrap glass wonders.
Terrariums are back, and in a big way! Even if you consider yourself a 'brown thumb' gardener, you can be successful with a terrarium. Once planted, these enclosed gardens nearly take care of themselves.
from a site called the terrarium museum This is also known as a Wardian case. Named after some Victorian guy who realised that you could keep plants alive long enough to transport in these glass cases.