On the heels of the yellow tape beam-of-light illusion, a simple yellow triangle painted on a flight of stairs transforms it from utterly ordinary to quietly surprising and wonderful.
What is it about a simple yellow triangle?

Or perhaps it is just…YELLOW.
We love Alexander Calder for his lessons in pure color…
via Quitokeeto; bottom photo Jose Paulo Andrade; Alexander Calder’s Yellow Panel via Ed Jansen/Flickr
am gladly happy in it