[woodandsteel]

He never stopped thinking about philosophical problems, and when he returned to academia his views had changed radically.

[Emma_Goldman]

True, but the 1920s were easily his least active, philosophically. He did most of the work for the Tractatus in the 1910s; most of the work for the Investigations in the 1930s.

[hyperpape]

He published Some Remarks on Logical Form in 1929. It's been 10 years since I was reading Wittgenstein, but my recollection is that work was still Tractarian. The blue and brown books came in the 30s.

[woodandsteel]

So it looks like I was mistaken.