It may be curious that Arabic is written from right to left, but we have to remember that ancient writing was not done on paper. Paleo-Hebrew was right to left as a written language. Arabic, Hebrew, Persian, Pashto, Urdu and Sindhi are the most widespread RTL writing systems today. Perhaps the writing tool originally used made this easier than modern pens. Some scripts (Chinese, Japanese) can be written vertically, although usually they are written horizontally.
ɪ t WORD_BOUNDARY m eɪ WORD_BOUNDARY b iː WORD_BOUNDARY k j ʊ ɹ ɹ iə s WORD_BOUNDARY ð æ t WORD_BOUNDARY æ ɹ ʌ b ɪ k WORD_BOUNDARY ɪ z WORD_BOUNDARY ɹ ɪ t ə n WORD_BOUNDARY f ɹ ʌ m WORD_BOUNDARY ɹ aɪ t WORD_BOUNDARY t ə WORD_BOUNDARY l ɛ f t WORD_BOUNDARY b ʌ t WORD_BOUNDARY w iː WORD_BOUNDARY h æ v WORD_BOUNDARY t ə WORD_BOUNDARY ɹ ɪ m ɛ m b ə ɹ WORD_BOUNDARY ð æ t WORD_BOUNDARY eɪ n t̠ʃ ə n t WORD_BOUNDARY ɹ aɪ t ɪ ŋ WORD_BOUNDARY w ʌ z WORD_BOUNDARY n ɑ t WORD_BOUNDARY d ʌ n WORD_BOUNDARY ɔ n WORD_BOUNDARY p eɪ p ə ɹ WORD_BOUNDARY p eɪ l ɪ oʊ h iː b ɹ uː WORD_BOUNDARY w ʌ z WORD_BOUNDARY ɹ aɪ t WORD_BOUNDARY t ə WORD_BOUNDARY l ɛ f t WORD_BOUNDARY æ z WORD_BOUNDARY ʌ WORD_BOUNDARY ɹ ɪ t ə n WORD_BOUNDARY l æ ŋ ɡ w ɪ d̠ʒ WORD_BOUNDARY æ ɹ ʌ b ɪ k WORD_BOUNDARY h iː b ɹ uː WORD_BOUNDARY p ɜː ʒ ə n WORD_BOUNDARY p æ ʃ t oʊ WORD_BOUNDARY ʊ ɹ d uː WORD_BOUNDARY æ n d WORD_BOUNDARY s ɪ n d h aɪ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ð ə WORD_BOUNDARY m oʊ s t WORD_BOUNDARY w aɪ d s p ɹ ɛ d WORD_BOUNDARY ɑ ɹ t iː ɛ l WORD_BOUNDARY ɹ aɪ t ɪ ŋ WORD_BOUNDARY s ɪ s t ə m z WORD_BOUNDARY t ə d eɪ WORD_BOUNDARY p ə ɹ h æ p s WORD_BOUNDARY ð ə WORD_BOUNDARY ɹ aɪ t ɪ ŋ WORD_BOUNDARY t uː l WORD_BOUNDARY ə ɹ ɹ ɪ d̠ʒ ɪ n ə l i WORD_BOUNDARY j uː z d WORD_BOUNDARY m eɪ d WORD_BOUNDARY ð ɪ s WORD_BOUNDARY iː z i ə ɹ WORD_BOUNDARY ð ʌ n WORD_BOUNDARY m ɑ d ə ɹ n WORD_BOUNDARY p ɛ n z WORD_BOUNDARY s ʌ m WORD_BOUNDARY s k ɹ ɪ p t s WORD_BOUNDARY t̠ʃ aɪ n iː z WORD_BOUNDARY d̠ʒ æ p ə n iː z WORD_BOUNDARY k æ n WORD_BOUNDARY b iː WORD_BOUNDARY ɹ ɪ t ə n WORD_BOUNDARY v ɜː t ɪ k l i WORD_BOUNDARY ɔ l ð oʊ WORD_BOUNDARY j uː ʒ uː ə l i WORD_BOUNDARY ð eɪ WORD_BOUNDARY ɑ ɹ WORD_BOUNDARY ɹ ɪ t ə n WORD_BOUNDARY h ɔ ɹ ɪ z ɔ n t ə l i WORD_BOUNDARY