His thoughts on their promiscuity were formed by listening to their conversations rather than through direct observation, sadly.

He begins with small oil painted canvases, watercolours and drawings done from direct observation.

The runner-up on the breakthrough list was the direct observation of planets orbiting stars.

For the next five years he worked only with drawing, always from direct observation, and with the allied disciplines of etching and aquatint, of which he became an innovative master.

They obscured direct observation of the highway by placing spruce tree branches along it.