I mean, drugs.
This is ultimately what keeps me away from cannabis: when I'm high, I absolutely experience the syncretism of concepts and experience. A couple times, though, I've made the mistake of writing down these insights and upon reviewing them sober, I see the stupidity as plain as my face.
I'm of the opinion that the individual processes of evaluation, if you will, are much less than the sum of the parts. Synthesis is the reward, not something to be postponed.