Yes, all we experience is our own perceptions and experiences... the "inner world".
Along those lines, do you find that suttas like the following ones are discussed in this context in Thailand?SN 35.23: Sabba Sutta http://www.accesstoinsight.org/tipitaka ... .than.htmlSN 2.26: Rohitassa Suttahttp://www.accesstoinsight.org/tipitaka ... .than.html
"Having understood name-and-form, which is a product of prolificity,
And which is the root of all malady within and without,
He is released from bondage to the root of all maladies,
That Such-like-one is truly known as 'the one who has understood'." (Snp 3.6)
"Whether I were to preach in brief, Sāriputta, or whether I were to preach in detail, Sāriputta, or whether I were to preach both in brief or in detail, Sāriputta, rare are those who understand." (A I 333, Sāriputtasutta)