Use paintable caulk to patch small ceiling cracks, not drywall compound! If you use drywall compound the crack is likely to reappear plus you have to sand it, ugh! Prepare a small bowl with soapy water (about a cup of water + a tsp of dish soap), put enough caulk on the crack to fill it, dip your finger or a scraper in the soapy water and smooth over the caulk, wait till it's dry and paint!
a water trombe wall combined with a dual purpose solar + stack ventilation chimney, with mechanically controlled vents, for an attached passive greenhouse/conservatory that also heats/cools the home, circulates air, and lets light and fresh air in
Danish artist Jeppe Hein‘s art installation the ‘Triangular Water Pavilion’ features two walls made of spy mirror glass and a wall of water. When a visitor moves close enough to the water wall, they activate a sensor and it falls, opening up to allow them to step inside the triangle. After they enter, the water starts flowing again, trapping the visitor in a space surrounded by mirrors and water.