Wonder if we will have chalkboards that can turn transparent and consume as little energy as e-ink displays. Memory is stored for intelligent "write-ahead," so

Wonder if we will have chalkboards that can turn transparent and consume as little energy as e-ink displays. Memory is stored for intelligent "write-ahead," so decades of past lectures fill in as the professor gestures and speaks. A calca-like mechanism for adhoc demos and dialog would also serve well after visitors speak on their papers.